I'm trying to install drain plumbing under my sink, and I can't seem to stop the slip joints from leaking.
Here's what I have right now (see picture):
- coming from the wall is a white plastic fitting
- very short piece of black plastic pipe (not really visible)
- 1-1/2" x 1-1/4" trap adapter
- approx. 6" piece of 1-1/4" tubing, most of which is inserted into the adjoining fittings
- 1-1/2" 45-degree elbow, with 1-1/4" adapter washers at both ends (see note below)
- 1-1/4" p-trap arm
- everything upstream from there seems to be leak-free (including the joint between the p-trap and arm)
I have leaks at the joints on both sides of the 45-degree elbow, and also where the tubing inserts into the trap adapter
I've taken all this apart and re-assembled multiple times, trying to be careful that everything lines up, but I always end up with leaks. Part of the problem might be that when I try to tighten one joint, I end up accidentally twisting another one out of alignment.
Any advice on how to make this work without leaks?
My current thinking is to replace the adapter + tube + 45-degree elbow with a 45-degree adapter. It would have to be a male (i.e., "street") fitting because there's basically no pipe left coming out of the white fitting to fit a female hub, and I really don't want to have to open the wall. If such a fitting exists, that would eliminate 2 slip joint connections. (Edit: I realized a street fitting wouldn't work either. I think I'm stuck with the 1-1/4" adapter unless I open the wall.)
A note about the 45-degree elbow:
The pipe from the wall is angled slightly downward, making an up-hill drain for a few inches. It's apparently been that way for years, and I'm not inclined to fix it (pun intended) unless someone here thinks it's a disaster waiting to happen. Rotating the 45-degree elbow slightly creates a straight connection for the p-trap arm.