Plumbing – What kind of j-trap will fit this pipe

EDIT: I bought a PVC 1" barbed to 1/2" threaded fitting and a kit with a 2' >braided hose and a shutoff valve. So I'll try bringing the 1" poly up to under the >sink, and then use these bits. We'll see...

I would have probably done that as well (caveat: I am only vaguely familiar with poly, aka "Polybutylene." I have never used it for a job or even had to replace it...It's very uncommon here in northeast Ohio. ) although at first thought, I'm not sure whether it makes a difference to put the Poly to PVC underground or above. I'd also probably put that poly above the sink, then put the Poly to PVC fitting > then the shut off valve, and finally, the braided hose to the faucet..

(FWIW, I'd still use copper, but my boss is extremely old-school..).

You'll need to install a drain assembly. In a bathroom, pop-up drain assemblies are common.

Here's an image of the drain assembly, with all the parts labeled.

_{(source: naturalhandyman.com)}

The tailpiece of the drain assembly, should attach to the trap assembly. If the trap is too low, an extension can be used.

When installing the drain, put a bead of plumber's putty around the drain hole of the sink. Then bed the drain flange in the plumber's putty. From below, install the washer and nut, and thread on the tailpiece. When you tighten it down, the excess plumber's putty will squeeze out. Use you finger, or a rag to remove whatever oozes out.