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How often should I replace supply lines under sinks and
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| plumber | Date: We, 08/12/2026, 4:57 AM | Message # 1 |
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| How often should I replace supply lines under sinks and toilets?
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| plumber | Date: We, 08/12/2026, 5:00 AM | Message # 2 |
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| Supply lines (the flexible hoses connecting shut-off valves to faucets and toilets) are one of the most overlooked maintenance items in a home, and a surprisingly common source of water damage when they fail.
General lifespan guidelines:- Braided stainless steel: 8–10 years, though many last longer if water quality is good.
- Plastic/PVC lines: 3–5 years — these degrade faster and are more prone to sudden failure.
- Rubber lines: should be replaced immediately if still present in a home — they're outdated and fail without much warning.
Signs it's time to replace, regardless of age:- Visible bulging, kinking, or discoloration in the line
- Rust or mineral crust at the connection points
- Any dampness or drip marks near the fitting, even if intermittent
Practical tip: since supply lines are inexpensive (often $10–20 each) but can cause thousands in water damage if they fail while you're away, many plumbers recommend replacing them proactively every 5 years as cheap insurance, rather than waiting for visible wear.
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| Guest | Date: Th, 08/13/2026, 2:51 AM | Message # 3 |
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Group: Guests
| Can a leaking supply line cause water damage even if the leak is very small?
I noticed a small amount of moisture around the connection of the water supply line under my bathroom sink. There is no obvious dripping, but the fitting feels slightly damp after using the faucet.
Can a small leak from a supply line cause serious water damage over time? Should I replace the entire supply line immediately, or can the connection simply be tightened?
What should I check before deciding whether the line needs to be replaced?
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| plumber | Date: Th, 08/13/2026, 2:52 AM | Message # 4 |
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| Can a leaking supply line cause water damage even if the leak is very small?
Yes. Even a very small leak from a supply line can eventually cause significant water damage, especially if it continues for days or weeks.
First, dry the connection completely and check it again after using the faucet. Moisture may come from the fitting itself, the flexible hose, or water running down from another part of the faucet.
If the connection is leaking, check that the supply-line nut is properly seated. However, avoid overtightening it, because excessive force can damage the fitting or the valve.
If the hose shows corrosion, bulging, cracking, kinking, discoloration, or damage near the fittings, replacing the entire supply line is usually the safest option. These hoses are inexpensive compared with the potential cost of repairing water-damaged cabinets, flooring, or walls.
It's also a good idea to know where the local shut-off valve is and make sure it operates properly. If the leak continues after checking the connection, or if the valve or fitting is corroded, have a plumber inspect it.
A small leak is much easier and cheaper to fix before it turns into a major water-damage problem.
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| Guest | Date: Sa, 08/15/2026, 4:08 AM | Message # 5 |
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Group: Guests
| Should I replace shut-off valves when replacing old supply lines?
I'm planning to replace the flexible supply lines under my kitchen sink and toilets because they are several years old. The shut-off valves themselves are also quite old, but they don't appear to be leaking.
Should I replace the shut-off valves at the same time as the supply lines? What are the warning signs that an old shut-off valve is no longer reliable?
Is a quarter-turn ball valve better than the traditional multi-turn angle stop for a bathroom or kitchen fixture?
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| plumber | Date: Sa, 08/15/2026, 4:09 AM | Message # 6 |
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| Should I replace shut-off valves when replacing old supply lines?
If the existing shut-off valves work properly, don't leak, and are in good condition, they don't necessarily need to be replaced every time you replace a supply line.
However, replacing an old valve can make sense when it is difficult to turn, doesn't completely shut off the water, leaks around the stem, or shows significant corrosion. An old valve that hasn't been operated for years may also begin leaking when someone finally tries to close it.
When replacing supply lines, it's a good opportunity to test each shut-off valve. Close it slowly and verify that the fixture stops receiving water. Then reopen it and check the valve and connections carefully for leaks.
For new installations, a quarter-turn ball-style angle stop is often convenient because it provides simple on/off operation and generally has fewer turns and moving parts than a traditional multi-turn valve. The exact choice should still be compatible with the existing plumbing and local requirements.
If an old valve is heavily corroded or cannot reliably shut off the fixture, I'd replace it rather than installing a new supply line onto a questionable valve.
It's also important not to force a seized valve. Applying excessive force can damage the valve or the plumbing connection behind it.
So, when replacing old supply lines, I would inspect and operate the shut-off valves at the same time. Replace them if they show corrosion, leakage, poor operation or questionable reliability. This is a relatively inexpensive preventive repair compared with discovering that the valve won't shut off during a plumbing emergency.
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| Guest | Date: Sa, 08/15/2026, 11:21 AM | Message # 7 |
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Group: Guests
| Can a washing machine hose burst even if it looks perfectly fine?
I recently replaced the supply lines under my sinks and toilets after reading about how much water damage a failed hose can cause. Now I'm wondering about the hoses connected to my washing machine.
The washing machine hoses look fine and there are no visible cracks or leaks. Can an old hose fail suddenly without showing obvious signs of wear?
Should standard rubber washing-machine hoses be replaced with braided stainless-steel hoses? Is there a recommended replacement interval?
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| plumber | Date: Sa, 08/15/2026, 11:22 AM | Message # 8 |
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| Can a washing machine hose burst even if it looks perfectly fine?
Yes. A washing-machine supply hose can fail suddenly even when there are no obvious external signs of damage. The hose is exposed to water pressure and repeated pressure changes every time the washing machine fills.
Older rubber hoses can become brittle or weakened internally with age. A hose may look acceptable from the outside while the material has already deteriorated.
Braided stainless-steel hoses generally provide better resistance to external damage than basic rubber hoses, but they aren't immune to failure. The connections and the hose itself should still be inspected periodically.
When checking washing-machine hoses, look for:
- bulges or soft spots;
- cracks or discoloration;
- corrosion around the fittings;
- kinks or sharp bends;
- moisture around either connection.
If the hoses are several years old or their age is unknown, proactive replacement is inexpensive compared with the potential damage from a burst hose.
It's also a good idea to turn off the washing-machine water supply when the machine won't be used for an extended period, particularly if the installation is in an area where a burst hose could cause significant damage.
Don't overtighten the connections when installing new hoses. The fittings should be properly seated according to the manufacturer's instructions.
For additional protection, some homeowners install an automatic water shutoff or leak-detection system near the washing machine. This can detect unusual water flow and shut off the supply before a small problem becomes major water damage.
The same principle discussed earlier in this thread applies here: a $20–$40 preventative replacement is usually much cheaper than dealing with a failed supply hose and the resulting water damage.
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| Guest | Date: Tu, 08/18/2026, 6:53 AM | Message # 9 |
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Group: Guests
| Can a toilet supply line burst without warning?
I have an older flexible supply line connected to my toilet. It isn't leaking, and there are no obvious signs of corrosion, but I'm concerned about a sudden failure.
Are there any warning signs that a toilet supply line is about to fail? Is a braided stainless-steel line significantly safer than an older plastic or rubber supply line?
Should I replace an old line preventively even if it still looks good?
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| plumber | Date: Tu, 08/18/2026, 6:53 AM | Message # 10 |
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| Can a toilet supply line burst without warning?
Yes. A flexible toilet supply line can fail suddenly, which is why these inexpensive components are worth inspecting periodically.Older rubber or plastic supply lines are more prone to deterioration with age. Braided stainless-steel lines are generally a better choice, although the braided exterior doesn't make them immune to failure. Before a failure, look for:- corrosion or rust around the fittings;
- bulging or deformation;
- kinks in the hose;
- discoloration;
- cracking or deterioration;
- moisture around either connection;
- mineral deposits near the fittings.
If any of these signs are present, I'd replace the entire supply line rather than attempting to repair it.Even when a line looks fine, age matters. The previous discussion recommends considering proactive replacement of older supply lines because the cost of a new hose is small compared with the potential damage from a failed toilet connection. When installing a replacement, make sure the hose isn't twisted or sharply bent and don't overtighten the connections. After installation, open the shut-off valve slowly and inspect both ends carefully for leaks.It's also worth checking the angle-stop valve at the same time. If it is corroded, difficult to operate or doesn't completely shut off the water, replacing the supply line while leaving a questionable valve in place isn't ideal. In short: a supply line doesn't have to be visibly leaking before it becomes a risk. If it's old, deteriorated or made from outdated material, preventive replacement is inexpensive insurance against a potentially serious water-damage event.
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| Guest | Date: Fr, 08/21/2026, 2:29 AM | Message # 11 |
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Group: Guests
| Can a dishwasher supply hose fail and cause a major leak?
I recently replaced the old hoses on my washing machine, but now I'm wondering about the water supply line to my dishwasher.
The dishwasher hose is several years old and there are no visible leaks or cracks. Since the hose is hidden inside the kitchen cabinet, I'm concerned that a small leak could go unnoticed for a long time.
How often should a dishwasher supply hose be inspected or replaced? Would a braided stainless-steel line be a better choice? Is there any way to detect a slow leak before it damages the cabinets or flooring?
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| plumber | Date: Fr, 08/21/2026, 2:30 AM | Message # 12 |
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| Can a dishwasher supply hose fail and cause a major leak?
Yes. A dishwasher supply line can develop a leak even when there are no obvious signs of damage. Because the connection is usually hidden under the kitchen sink or inside a cabinet, a small leak can go unnoticed and cause damage to the cabinet base, flooring or nearby materials.
The first step is to inspect both ends of the supply line. Look for moisture, mineral deposits, corrosion, kinks or deterioration around the fittings. It's also worth checking the hose after the dishwasher has completed a cycle, because some leaks only appear when the appliance is filling.
If the hose is several years old or its age is unknown, proactive replacement can be reasonable. The same principle discussed earlier in this thread applies to washing-machine hoses and other flexible supply lines: a relatively inexpensive replacement is usually preferable to waiting for a sudden failure.
A braided stainless-steel dishwasher connector can provide good resistance to external damage, but the braided covering doesn't make the hose failure-proof. The fittings and connection points still need to be installed correctly and inspected periodically.
I'd also check the shut-off valve under the sink while replacing the hose. If it is corroded, difficult to operate or doesn't completely stop the water, this is a good opportunity to replace it rather than connecting a new hose to an unreliable valve.
For additional protection, a water-leak sensor or automatic shutoff system under the kitchen sink can provide an early warning. This can be particularly useful because a dishwasher may operate while nobody is home.
A practical maintenance routine would be:
Inspect the hose and fittings periodically.
Check underneath the sink after a dishwasher cycle.
Replace hoses that are old, damaged or of unknown age.
Make sure the shut-off valve works.
Consider a leak detector under the sink.
The important point is that a dishwasher hose doesn't have to be visibly damaged to become a risk. Since it's inexpensive and often hidden from view, preventive replacement is usually much cheaper than repairing water-damaged kitchen cabinets and flooring.
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| Guest | Date: Mo, 08/31/2026, 5:46 AM | Message # 13 |
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Group: Guests
| Should I install an automatic water shutoff for a washing machine?
I've already replaced the old washing-machine hoses with new braided stainless-steel hoses, but I'm still concerned about the possibility of a sudden hose failure.
The washing machine is located on the second floor, so even a relatively small leak could cause significant damage before anyone notices it.
Would an automatic water shutoff or leak detection system be worthwhile? How do these systems detect a burst hose, and are there any disadvantages to leaving the water supply turned on when the washing machine is running?
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| plumber | Date: Mo, 08/31/2026, 5:46 AM | Message # 14 |
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| Should I install an automatic water shutoff for a washing machine?
An automatic water shutoff can provide an additional layer of protection, particularly when a washing machine is located on an upper floor or in an area where a burst hose could cause substantial water damage.
A leak-detection system can monitor water flow and/or use sensors to detect water where it shouldn't be. If the system detects an unusual flow pattern or water on the floor, it can close an electronically controlled shutoff valve. The previous discussion in this thread already recommends automatic shutoff or leak detection as an additional precaution for washing-machine installations.
There are two important types of protection:
- Leak sensors: detect water on the floor or in a designated area.
- Automatic flow monitoring: looks for unusual or continuous water consumption and can shut off the supply.
For a washing machine, flow monitoring can be particularly useful because a failed hose can release a large amount of water while the appliance is filling. A floor sensor provides another layer of protection if water reaches the protected area.
However, an automatic shutoff should not be considered a replacement for good hoses and regular inspection. Continue checking for:
- corrosion around the fittings;
- bulges or deformation;
- cracked or damaged hoses;
- kinks or sharp bends;
- moisture around connections.
The shutoff valve itself should also be tested periodically. A protection system is only useful if the valve actually closes when an emergency occurs.
If the washing machine is used infrequently or the home is vacant for long periods, manually closing the supply valves when the machine isn't being used can provide additional protection. The existing thread also recommends considering this approach when a burst hose could cause significant damage.
When choosing an automatic system, check whether it requires continuous electrical power, Wi-Fi, batteries or a subscription service. A system that depends on an internet connection shouldn't be the only form of protection.
For a second-floor washing machine, I would consider an automatic shutoff with both leak sensors and flow monitoring. Combined with quality hoses and periodic inspection, it can significantly reduce the risk of a small plumbing failure turning into major water damage.
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| Guest | Date: Fr, 09/04/2026, 2:10 AM | Message # 15 |
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Group: Guests
| How can I detect a slow leak from a hidden water supply connection?
I have several plumbing connections hidden inside cabinets and behind appliances. There are no obvious leaks, but I'm worried that a small leak could continue for a long time before it becomes noticeable.
Are there simple ways to check for a slow leak around supply lines and fittings?
What warning signs should I look for before water damage becomes serious?
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| plumber | Date: Fr, 09/04/2026, 2:11 AM | Message # 16 |
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| A slow plumbing leak can remain unnoticed for quite a while, especially when the connection is inside a cabinet or behind an appliance. Regular inspection can help catch the problem before significant damage occurs.
Start by checking accessible connections for:
- Dampness or water droplets
- Mineral deposits or white/green corrosion
- Rust around metal fittings
- Discoloration or swelling of cabinet materials
- Musty odors
- Warped flooring or cabinet bottoms
- Staining around pipes or connections
For a suspected slow leak, dry the area completely and place a dry paper towel beneath the connection. Check it again after using the fixture or appliance. Even a small amount of moisture can reveal where water is escaping.
For appliances such as dishwashers and washing machines, inspect the connections after the appliance has completed a fill cycle because some leaks occur only when water is flowing under pressure.
A moisture sensor placed near a hidden connection can provide an early warning. Automatic water shutoff systems can provide additional protection, particularly in areas where a failed hose could release a large amount of water.
Don't ignore mineral deposits or repeated dampness simply because there is no active dripping. A connection that repeatedly becomes wet should be identified and repaired.
It's also worth checking the local shut-off valve whenever you inspect a supply line. A valve that cannot completely stop the water can turn a small plumbing problem into a much larger emergency.
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| Guest | Date: Fr, 09/11/2026, 5:42 AM | Message # 17 |
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Group: Guests
| Can an improperly installed supply line cause a leak even when the hose is new?
I recently replaced the flexible supply lines under my sinks and toilets with new ones. The hoses are brand new, but I'm still concerned about leaks developing at the connections.
Can a supply line fail because it was twisted, bent too sharply, or overtightened during installation?
What is the correct way to install a flexible supply line so it lasts as long as possible?
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| plumber | Date: Fr, 09/11/2026, 5:43 AM | Message # 18 |
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| Even a new supply line can develop a leak if it is installed incorrectly.
The hose should be routed naturally without excessive twisting, sharp bends, kinks, or tension. A supply line that is forced into position can put unnecessary stress on the fittings and connection points.
A few installation practices are particularly important:
- Make sure the hose is long enough to reach the connection without being stretched.
- Avoid sharp bends or kinks.
- Do not twist the hose while tightening the fittings.
- Make sure the connection is properly seated before tightening.
- Do not overtighten the compression or supply-line connection.
- Keep the hose away from sharp edges and sources of excessive heat.
- After installation, open the shut-off valve slowly and inspect both connections for leaks.
Overtightening is a common mistake. More force does not necessarily create a better seal and can damage the fitting, valve, or sealing components.
It's also worth checking the supply line again after the fixture has been used several times. A connection that appears dry immediately after installation can sometimes develop a small leak under normal pressure or movement.
If a supply line is too short, don't stretch it to make it fit. Replace it with the correct length. Similarly, if the existing shut-off valve is corroded or doesn't operate properly, installing a new hose onto it won't solve the underlying problem.
A properly selected and correctly installed supply line should have enough slack for normal movement without being loose or under tension.
The goal is simple: the hose should connect naturally, remain free of stress and kinks, and both fittings should be properly seated without excessive tightening. This helps minimize the chance of a premature leak.
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| Guest | Date: Th, 09/17/2026, 3:07 AM | Message # 19 |
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Group: Guests
| Can the way a flexible supply line is installed affect how long it lasts?
I recently replaced several old supply lines under my sinks and toilets. The new hoses are not leaking, but I'm wondering whether installation technique can affect their service life.
Can twisting, bending, or putting too much tension on a flexible supply line cause it to fail prematurely? What should I check after installing a new one?
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| plumber | Date: Th, 09/17/2026, 3:07 AM | Message # 20 |
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| Yes. A flexible supply line can be damaged or put under unnecessary stress if it is installed incorrectly.
Even a new hose can have a shorter service life if it is sharply bent, twisted, stretched, or forced into a position that puts constant pressure on the fittings.
After installation, check that:
- The hose is long enough to reach the connections without being stretched
- There are no sharp bends or kinks
- The hose is not twisted
- The fittings are properly aligned
- The connections are not under sideways tension
- The hose is not rubbing against a sharp cabinet edge
- There is enough room for normal movement and maintenance
- The connections are tightened according to the manufacturer's instructions
Avoid using an excessively long hose and coiling it tightly into a small space. A gentle curve is generally preferable to a sharp bend.
It's also important not to use the supply line to compensate for poorly positioned plumbing connections. If the hose has to be forced sideways or pulled into position to connect, the underlying piping may need to be adjusted.
After installation, open the shut-off valve slowly and inspect both connections. Run the fixture for a while and check again for moisture. It is also useful to inspect the connection later after the plumbing has been under normal operating pressure.
Don't overtighten the fittings in an attempt to prevent leaks. Excessive tightening can damage threads, seals, or the valve connection.
For braided stainless-steel supply lines, remember that the braid protects the hose from some types of external damage but does not make it immune to failure. The inner hose and fittings can still deteriorate.
A properly installed supply line should have a relaxed routing with no excessive tension, twisting, or sharp bends. Taking a few extra minutes during installation can reduce unnecessary stress on the hose and make future inspection much easier.
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| Guest | Date: We, 09/23/2026, 3:51 AM | Message # 21 |
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Group: Guests
| Can high water pressure shorten the life of flexible supply lines?
I recently replaced several old supply lines under my sinks and toilets, and the new ones were installed correctly without kinks or excessive tension.
However, the water pressure in my house sometimes seems quite high. Could excessive water pressure put additional stress on flexible supply lines and their connections?
Should I measure the pressure and install a pressure-reducing valve if it is too high?
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| plumber | Date: We, 09/23/2026, 3:52 AM | Message # 22 |
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Soldier
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| Yes. Excessive water pressure can put additional stress on plumbing fixtures, valves, flexible supply lines, and their connections.
A supply line is designed to operate within a specified pressure range. Even a high-quality braided line can eventually develop problems if the plumbing system regularly operates at excessive pressure.
A simple pressure gauge connected to a suitable hose connection can help determine the actual water pressure. It is useful to check the pressure when no fixtures are running and, if necessary, observe whether it changes significantly during normal use.
If the pressure is consistently above the range recommended by local plumbing requirements or the equipment manufacturers, the plumbing system should be evaluated.
A pressure-reducing valve may be appropriate in homes with excessive incoming pressure. However, it should be correctly sized and adjusted rather than simply installed without measuring the existing pressure.
High pressure can affect more than supply lines. It can also contribute to:
- Premature wear of shut-off valves
- Faucet and toilet valve problems
- Leaks at plumbing connections
- Stress on water heaters and other appliances
- Water hammer and noisy pipes
- Shorter service life of flexible hoses
If you have a pressure-reducing valve already installed, it is worth checking whether it is functioning correctly. A failing or improperly adjusted valve can allow pressure to become higher than expected.
It's also important to remember that pressure is only one factor. A supply line can fail because of age, corrosion, poor installation, excessive bending, chemical exposure, or damaged fittings even when water pressure is normal.
If several unrelated plumbing connections begin leaking around the same time, checking the home's water pressure would be a reasonable part of the investigation.
The best approach is to measure the pressure first and then decide whether any adjustment or pressure-control equipment is necessary. Maintaining appropriate water pressure can help protect the entire plumbing system, not just the flexible supply lines.
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| Guest | Date: Sa, 10/03/2026, 3:43 AM | Message # 23 |
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Group: Guests
| Can using the wrong size supply line cause leaks or poor water flow?
I replaced an old flexible supply line under my bathroom sink, but I'm not completely sure I used the correct size. The new line fits both connections, but I'm wondering whether the length, diameter, or thread type can affect reliability or water flow.
Can using an incorrectly sized or incompatible supply line cause leaks even if the connections seem tight?
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| plumber | Date: Sa, 10/03/2026, 3:44 AM | Message # 24 |
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Soldier
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| Yes. A supply line can appear to fit while still being the wrong type or size for the installation.
The most important factors are the connection sizes, thread type, hose length, and the manufacturer's intended application. A line should reach the connections naturally without being stretched, twisted, or forced into position.
Problems can occur when:
- The connection size or thread type is incorrect
- The hose is too short and under tension
- The hose is excessively long and sharply looped
- The internal diameter is too small for the application
- An adapter is used incorrectly
- The fitting does not seat properly
- The connection is overtightened
A restricted internal passage can reduce flow, although a noticeable flow problem can also come from the shut-off valve, faucet, aerator, or another restriction elsewhere in the plumbing.
When installing a replacement, compare the old and new connectors and verify the specifications rather than relying only on whether the fittings physically screw together. Use the correct sealing method for the particular connection; not every supply-line fitting is designed to be sealed with thread tape.
After installation, open the shut-off valve slowly and inspect both connections. Check again after the fixture has been used and periodically afterward.
If you're unsure about the compatibility of a supply line, replacing it with the correct connector is usually much easier than dealing with a leak caused by a mismatched fitting.
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