MikeinLA
New Member
Hello and thank you for allowing me to join your group. I am about to replace a bathroom sink, vanity and plumbing. I took a look underneath to check things out and in addition to the normal water shutoffs, drain pipe, etc, I see a black plastic pipe which leads from above the trap on the drain pipe to a metal pipe that's sticking out of the wall. I can't figure out what it is. I once replaced a powder room vanity and plumbing and it didn't have such a pipe. Does anyone know what it is?
Thanks in advance, Mike
Thanks in advance, Mike