I have a 25-30-year-old Quest shutoff valve under my sink that I need to replace. I was trying to isolate a faucet drip, and I turned off the hot water at the shutoff valve under the sink for the first time... Now it won't open back up fully. It still works, kind of, but it's ancient and should be replaced anyway.

I know very little about plumbing, but this would appear to be two compression fittings. I'm not sure what diameters I'm going for, though. Does this setup look familiar to anyone? I think all I need is two compression fittings, the shutoff valve, and a couple wrenches, or will cutting the pipe be necessary due to the old compression fittings possibly bending the pipe ends?

Actually, since, as you can see, it's rigid pipe connecting to the valve on both sides--no flexible tube--will I not have the room to cut the pipe if necessary? How do I get around this? The grey pipe goes up, couples with a copper pipe and into the sink handle valve, and a braided supply line goes from the handle valve to the faucet. Would it be easiest to not use any of the current pipe connecting the shut-off valve to the handle and replace it with a flexible 18" braided tube?

I've just read I need to use Quest parts for these old Quest pipes. Will Home Depot have them, or should I just order what I need (once I figure out what I need)?

The grey pipe that goes up to the copper that goes up to the handle valve is 3/8" OD, the copper coming out of the wall is I think 5/8". Would something like this work? http://plumbing.hardwarestore.com/52-306-stop-valves/angle-stop-valve-664979.aspx

What fittings would I need in addition to that valve? I read elsewhere that I have to use Quest compression fittings for grey Quest pipes...

Edit: My attachments didn't show up...

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Hi Ralph...

If you truly have copper pipe coming out of the wall then you should be able to remove the quest shutoff and cut the old compression sleeve (under plastic nut) off with a mini hacksaw or similar tool and simply install a new 5/8" OD x 3/8" compression angle stop (see large image) and you should be all set.

You could also install a sharkbite PUSH-FIT type angle shutoff... simply pushes on... see smaller image.

Then, install a new 3/8" compression x 1/2" female braided hose of any length you like...

Should be that simple ;)

Any questions, just let me know.

Mark

Thanks Mark, you're the man! :)

Bought a common compression angle stop and the braided cord you recommended, fits great and was no trouble!

Hey! Glad you're all set! Thank you for taking the time to let us know...

Mark