![]() Even a metal trap compression nut can crack if it has been over tightened. One of the most common causes of a P trap leak is over-tightening a “lock nut.”ĭrain trap manufacturers specifically warn against over-tightening, since this can cause the materials to crack. While this might fall into the “Improper Installation” category, over-tightened compression nuts are specific enough to deserve their own category. Additionally, the speed at which a P trap or its collection of important pieces can corrode depends on the corrosivity index in the draining water, corrosivity of waste poured down the drains, and the thickness of the plumbing material.Ī thin-walled P trap pipe or an improperly fitted compression nut is likely to invite corrosion, leading to a leak. Some pipes or compression nut materials are more susceptible to corrosion than others. They must be installed with the beveled edge facing the correct direction and the pipes must be measured to fit correctly.Ī P trap is likely to keep leaking if it is installed without an important piece to the P trap puzzle, or with a piece facing the wrong direction. Internal washers must be used to prevent leakage. While it might not look complicated, installing a P trap correctly to prevent leaks can be a bit more involved than you might anticipate. It might be valuable to know how to fix a P trap since your home has so many of them! What Are Causes Of A Leaking Sink P Trap? Improper Installation Toilets, sinks, showers, and other drains are all connected to a P pipe. Gases want to escape the pipe by going up or down, but they get “trapped” in the curve of this P pipe. The entire purpose of a P trap in your sink piping is to block sewage gases from wafting up your pipes, through your drain, and into your home. Through this process, gases form, creating a smell we associate with sewage, which can also be dangerous in large exposures. However, since water is not constantly running through these pipes, they can dry out, allowing the waste to decompose and rot. In plumbing systems, wastewater and the substances within them go down the drain and into a sewage system. That’s why this pipe is known as a P trap. While at first glance this pipe looks like a U, if you tilt your head or turn the pipe on its end, you’ll notice the P. If you look in the cabinets under your sink, you’ll see that curved, U-shaped pipe going directly down from the bottom of your sink. What is a P Trap?īefore you can learn how to fix a P trap, you have to understand exactly what it is. If the leak is left too long, you might start to get some strong sewage smells in and around your sink. ![]() This is wastewater leaking, so the issue needs to be solved quickly to prevent it from contaminating your home. The first signs of a leaky P trap under a bathroom or kitchen sink might be a small pool of water growing on the floor. Trenchless Water Line Replacement & Repair.
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