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re: P trap help - how would you repair?

Posted on 3/21/24 at 9:25 am to
Posted by MrBobDobalina
BRo.LA
Member since Oct 2011
2996 posts
Posted on 3/21/24 at 9:25 am to
The OG plumber that installed this is who fricked you from the jump. Normally in houses the only thing that needs a 2" drain is a washing machine. If I was coming fix this at your house...I'm either

A.) Cutting out that Tee and replacing it with a 2x1-1/2" tee or
B.) Using a socket saver to remove pipe "B" out of the tee, and glueing a 2x1-1/2" bushing into the tee. You can see the bushing glued in to the top of fitting "C" currently

The fitting that is glued above C is called a trap adapter....it adapts from glue style to SJ (slip joint) to allow you to intall a slip joint trap. It has totally missed its purpose by being before the trap.

The trap adapter would be glued into the Tee where pipe "B" is currently, and all connections after that would be made leak free with hand tight + 1/4 turn.

Plumbing is easy to do but tricky to do right. This would be year 1 apprentice work at our shop. Defintiely do not just wrap it as that will not stop the leak and will encourage mold growth in the warm, still and dark of your cabinet space.

That'll be $175
Posted by VanRIch
Wherever
Member since Sep 2007
10492 posts
Posted on 3/21/24 at 9:42 am to
Here’s the full system:


I also noticed they put 2” under our main sink
Posted by Turnblad85
Member since Sep 2022
1316 posts
Posted on 3/21/24 at 11:16 am to
quote:

Normally in houses the only thing that needs a 2" drain is a washing machine.




I've seen houses where even the lavs were p-trapped with 2" just like the OP has. I think the plumbers are thinking the oversized traps will help prevent clogging and maybe avoiding using slip-joint plumbing which all seems to be made as cheaply as possible.

They must think they are giving a premium option since it would've been easier to come off the 2" T with a 1 1/2 slip bushing and trap it "normally".

OP I don't understand why it won't seal unless cross threaded or damaged. It you don't want to cut anything out then you'll just have to try some sealants or tefon tapes. When/if you do find something that works, put a plastic tray under leak points and a water alarm in tray so you know if it starts leaking again.
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