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⚠⚠⚠PLEASE NOTE: we have a newer improved shorter version of this topic shot in 4K video recently here: "How To Install Bathroom Sink Drain/Faucet, No Leaks Under Gasket, Threads [SOLVED]" • How To Install Bathroo...
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Is your bathroom sink leaking? Can't find the source of the bathroom sink drain leaking? We show you how to fix a bathroom sink drain leaking underneath the sink where the black rubber drain gasket meets the bottom of the bathroom vanity sink basin, or drain pipe threads.
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Leaking sinks:
You install a new sink drain properly yet still get leaking sink drain leaking underneath. You installed the drain flange with silicone and still get the bathroom sink drain leaking from the drain gasket.
Don't call a plumber for a leaking sink drain pipe plumbing repair, you can fix a bathroom leaking sink drain yourself, leave that drain leak behind.
Glacier Bay Mandouri Led Bathroom Sink Faucet video applies to all bathroom vanity faucets not just a glacier Bay sink.
We'll show you how to fix the bathroom sink drain that is leaking. We show you 3 causes of bathroom vanity sink drain to be leaking underneath the sink basin at the threads.
The bathroom sink drain could be leaking at the rubber drain gasket where it mates to the bottom of the sink basin. You get leaks where the drain pipe meets the sink trap, or where the sink trap meets the street drain line.
We also cover whether your leaking drain repair should use plumber's putty to avoid staining the bathroom vanity sink. We'll also cover Teflon tape (plumber's tape), pipe dope sealant, and silicone to fix the bathroom sink drain.
Note on wrapping Teflon plumber's tape for this repair:
The lower Teflon tape for the black drain gasket should be wrapped counterclockwise, to match the direction of the drain gasket screwing upward from underneath the leaking sink basin. The upper Teflon tape should wrap clockwise around threads of the leaking drain pipe to match the direction of the drain flange inside the sink, screwing down onto the pipe threads in a clockwise motion.
After you fix your leaking sink drain pipe threads, you have to perform thorough water leak tests to confirm the water is not dripping inside your vanity via a sink leaking water down the drainpipe. Don't just turn on the water for a few seconds and think that you have fixed the bathroom sink drain.
Now you have to test for a leaking vanity drain.
You still have to fill up the sink basin with water until it starts to drain out through the overflow hole, then you also need to let the water suddenly all drain out. You have been moving a lot of parts underneath your bathroom vanity sink, so make sure to test for the sink trap leaking as well. If the sink trap is leaking, we add pipe thread sealant to the leaking trap connection.
Causes of your bathroom sink drain leaking underneath
One common drain installation mistake is when DIY folks fail to make sure the drain flange is screwed all the way down onto the drain pipe threads, and end up with a leaking vanity drain. Water then seeps through the crack between the flange and the pipe and leaks down onto the drain pipe threads or over the rubber gasket.
Another failure causing a bathroom sink drain leak and plumbing repair: if drain holes underneath the sink basin has imperfections preventing the gasket from mating up to the sink for a perfect seal.
Now you have a bathroom sink leaking from underneath the drain because the rubber drain gasket underneath the basin cannot fill all the imperfections along the rim of the sink's flawed drain hole opening.
How to solve bathroom sink drain leaking from threads
Some people have issues installing Moen faucet systems with Moen drains and they have a leak. Drain leaks happen with Glacier Bay as well, the leaking vanity drain is allowing water to leak down the threads of the drain pipe under the vanity sink. It is one root cause of your bathroom sink leaking from the drain gasket.
Why is my sink leaking?
The drain repair solution for this vanity sink leaking issue is to wrap the plumber's tape around the top of the pipe threads where the drain flange will screw on. Wrap tape on pipe threads where the rubber drain gasket will screw on to mate up to the bottom of the basin underneath inside the vanity. We are done with our bathroom sink repair.
That completes this drain repair, use this video to put a stop to your bathroom sink drain leaking water.