A long time ago I picked up two chrome shut off valves for my kitchen sink supply. I'm finally getting around to the project and am going to run new 1/2" copper straight up (vertically) through the floor to under the sink. So I need straight valves.

It turns out the ones I have are 5/8" OD compression x 3/8* OD compression. That isn't what I wanted. Is there a way to use these with the 1/2" copper stubs I'm plumbing in or do I have to scrap them (trying to avoid that)?

If not them, what do I ask for for straight valves for this situation?

Thanks guys!



Edited 1 times.

The (nominal size) 1/2" copper IS 5/8" OD

If you have straight 5/8 comp x 3/8 comp stops you are good-to-go.

==============================================

"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

no dishwasher?

also no ice maker line?

Ice maker ??? Wasn't thinking about the dishwasher. How do I accommodate that?

Thanks.

I've only used compression fittings for steel lines (automotive). Anything special to prep the copper? Is the ferrule re-usable in the future if I pull the valve off?



Edited 1 times.

if you have a dishwasher you would require two outlets from the hot side. If you have a refrigerator with an ice maker line it would typically require two outlets on the cold side unless there is a dedicated branch already piped.

For two outlets you can use a three way valve or a dual control valve.





You could also add a "quick tee branch adapter" if you really want to use your existing valves.



[www.plumbingsupply.com]



Edited 3 times.