Plumbing – Where to install water shutoff valve

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..).

I think kitchen sinks are 3/8" (but I can never remember). So you'll want a 3/8" female, 1/4" male, 3/8" male tee. You should be able to find one at the local big box, or hardware store.

Something like this

1. Shut off the water using the shutoff valve.
2. Remove the existing supply line.
3. Attach the tee where the supply line used to be.
4. Connect the sink supply to the 3/8" male outlet on the tee.
5. Connect the refrigerator supply to the 1/4" outlet on the tee.

NOTE: Use your preferred pipe dope method (tape or goop), however, since it's a brass fitting dope should not be required.