Sylvan and/or Fourth year:
I went and got a cap, actually, it is a fitting that fits over 1 1/2″ copper pipe on one end, and on the other end, it has female threads. I tried it at the store, and it fit perfectly over 1 1/2″ copper pipe. since they didn’t have a male threaded copper cap, I bought one in PVC. HOWEVER, after cleaning the copper pipe, and trying to fitting, I find that both are the same diameter, and the fitting therefore won’t go over this “pipe”. Tell me, is this 6″ copper piece on the old drain a piece of pipe, or is it part of that hex fitting that screws into the ell bow? If it is part of the fitting, do they make a cap that will work with this, and what is it called? The reason I am going this route rather than the one you described, is the fact that working room is very limited, and if I start to cut the inside of the nipple, there is no turning back. Any suggestions?