Hello,

I am in the process of renovating a bathroom necessitated by a crack in my old FG Bath/shower unit. I have bee wanting to replace the bathtub with a shower.

It is my understanding that 2" piping is required by code for a shower. The bath was plumbed with 1-1/2 as standard(almost seems like it might have been 1-1/4" on the metal part of the drain.

If you look at the picture attached there is 1-1/2" abs pipe going into the P-Trap. The P-Trap itself appears to be a 2" based upon specs for 2" ABS DWV fittings (O.D 2.38"). However it also appears that the P-trap is 1-1/2" on the house side and 2" on the outboard side. You can see in the picture that the union to the 1-1/2" pipe has a thick wall to it, and feeling in the hole I can detect a much thinner union wall.

Question: do they make reducing P-Traps? I suspect I have 2" lines at the P-trap and 1-1/2" above. I want to install a shower AND I want to be in compliance with code. I need to get some things cleared up before proceeding, and chipping out concrete and breaking apart drainage piping.

Picture I forgot to attach

https://dl.dropboxusercontent.com/u/12183322/CIMG1375.JPG

With a little more inspection I suspect that I am looking at a 2" P-trap with a 2" x 1-1/2" Bushing reducer glued into it.. I believe I can feel it with my fingernal.

So I'm guessing I need to remove enough concrete to reveal the drain pipe, cut inset a union and a new P-Trap and go 2" all the way?

Hi Andy

Yup! Looks something like what you propose. As you said, remove enough concrete to reveal the drain pipe, cut the pipe and install a coupling and a new 2" P-Trap directly under the new shower strainer.

Good luck!

Mark

I'm guessing that I should have the new shower pan here before I do anything in order to make sure I have proper alignment with the drain before back filling the foundation with new concrete.