My house was built in early 70's.. No plastic.. I'm putting in a new sink and had to remove the wall pipe that goes into the wall.. I needed a longer one.
It seem where it goes in behind the wall into the plumbing there was some type of gasket as pieces of it fell out when I removed the pipe.. I can tell with my finger that there is a ridge in there where a gasket could fit..
What would I call it at Home Depot or should I just load it up with silicone?
It is a 1 1/2 " waste pipe..

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My house was built in early 70's..No plastic..I'm putting in a new sink and had to remove the wall pipe that goes into the wall..I needed a longer one.
It seem where it goes in behind the wall into the plumbing there was some type of gasket as pieces of it fell out when I removed the pipe..I can tell with my finger that there is a ridge in there where a gasket could fit..
What would I call it at Home Depot or should I just load it up with silicone?
It is a 1 1/2 " waste pipe..

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Hi ,
If there's no plastic then you have a 1 1/2" copper stub out. The method used to connect a lavatory at installation is to remove the chrome finish from the section to be soldered down to the bare brass of a 1 1/2" metal "P" trap and solder it in to the copper pipe. I have no idea what kind of a gasket would be used to rig up such a connection but it's my guess that a plumber didn't do it. The silicone idea will give you trouble in the long run. My advice ? Do it the right way and solder it in. Good luck, Tom

The hole in the wall isn't much bigger than the pipe..
I'll try to solder but I don't have a lot of room.
I see no evidence that the original waste pipe was soldered and for sure there was a gasket.. maybe neoprine..