Do these old stub pipes typically have a set screw or just use a caulk seal

[Tim222]

Late 1940s/early 1950s vanity drain pipe. The metal nut that connects to the trap has corroded and crumbled to dust, so I need to replace the drain pipe. But it won't budge in the stub that comes up out of the tiled floor. The former owners tiled over tile, so I don't know if there's a set screw below tile level securing the drain pipe in the stub pipe. Did they typically use set screws?

 

[James Henry]

take a wire brush and scrub around the joint.. Look for a solder joint. a lot of old sink drains were installed that way. if it is soldered you'll need this.

 

[Sponsor]

 

[James Henry]

Or this.

 

[MACPLUMB]

You will find that it connects under the floor to the drain pipe, go underneath and you can cut it off there and replace

 

[Tim222]

take a wire brush and scrub around the joint.. Look for a solder joint. a lot of old sink drains were installed that way. if it is soldered you'll need this.

Thank you, James Henry. You were right about the solder. Does that threaded ring get soldered around the old sleeve? Then a compression gasket and the compression nut are used to establish the new seal with the waste pipe?

 

[Tim222]

You will find that it connects under the floor to the drain pipe, go underneath and you can cut it off there and replace

Thanks, 777. I neglected to mention that this is an upstairs bath.

 

[James Henry]

Thank you, James Henry. You were right about the solder. Does that threaded ring get soldered around the old sleeve? Then a compression gasket and the compression nut are used to establish the new seal with the waste pipe?

Correct. You will have to heat up that drain pipe to soften the solder and pull the stand pipe up and out. If you want you can just clean everything up and re-solder the pipe back in place.

 

[Reach4]

I think that was an S trap, so your new drain system should incorporate an AAV.

 

[James Henry]

I think that was an S trap, so your new drain system should incorporate an AAV.

I missed that.

 

[MACPLUMB]

Perfect open the dnstrs ceiling and go to work,

 

[Reach4]

Are you looking for something pretty, or something that you can conceal?

What is the OD of that pipe?

I am thinking of cutting that vertical, put a chrome slip 90 on top, and feed a Studor trap vent into the 90. Photos not to scale. I don't know if there is enough space.
https://ipscorp.com/plumbing/brands/studor/trap-vent/