Installing Drain For Sink

Question

in a utility room at my home there is the water line and sewage line capped off bc they were not being used. What I want to do is add a utility sink in this location.

Cutting the water, cutting the cap, and throwing on a sharkbyte cut-off for the hot/cold water then running the water line from the sharkbyte to the hot/cold faucet is no problem to me.

What I am not sure how to do is set-up the plumbing for the sink drain. I assume it'll need a P-Trap, and I'll need to head to my local box store to pick up the supplies for that...but how do I "install" or "set-up" this plumbing?

The utility sink i purchased came with 1 1/2 pipes which connects no problem to the faucet that came with the sink...the issue I have is that the 1 1/2 plastic pipe fits completely inside of the pipe coming from the wall (image below) - what do I do here?

i keep getting an error trying to upload my image so here is a link

https://ibb.co/b7Qmg7T

Answer 1

A 1-1/2" pipe from a trap that fits completely inside a 1-1/2" pipe from the wall is...utterly normal.

Drain pipe and trap fittings are different actual sizes for the same nominal size. Or, you might have a 2" drain in the wall, still, it will be drain-pipe sized, and a trap adapter is available to fit that, too.

You need a trap adapter for the end of the wall pipe, which has a compression fitting that the (thinner wall, different relationship to nominal size) tailpiece from the trap gets clamped by (it's a slip fit, and then you screw it tight to seal)

One possibility is that you have a trap adapter sticking out of the wall (though your picture does not match your description of having 1-1.5 feet of pipe sticking out of the wall...) and simply need a new compression seal and compression nut. The other option is that what's sticking out is pipe thread (which will be a different size, and tapered if you look at it closely.)

Answer 2

It's hard to tell because it seems to be covered in paint but is that a threaded connector in the wall? If you buy a complete P-trap kit with a horizontal arm, the arm is meant to fit inside that pipe and should include a compression nut to fit that thread. If that's a thread.

There are LOTS of youtube videos on how to do this. It's better to get an overview from there, take a stab at it, and come here to solve specific problems.

Meanwhile you should cover the drain to prevent sewer gases in your room. A sandwich bag and a rubber band will do.

If you've never fitted a drain basket to a sink before, that's a little more involved, not quite as obvious or mechanical as the trap connections. Also easily learned on youtube and with some trial and error ... so keep a bucket underneath the sink :)