Kitchen shutoff valve sizes

[GreekGuy7]

Kitchen shutoff valve sizes
Author: greekguy7 (IL)
I went to put in a Moen faucet that had the supply lines already attached: 3/8" compression connection at the end of them which is very typical application.

It turns out the shutoff valves I had in there were 1/2"compression on the end. Darn! Went to get some adapters to go from 1/2" compression to 3/8" compression and one of them dripped so I changed out the entire shutoff valve, and was on my way.

You see a lot of shutoff valves in kitchen or baths that are 1/2"? Seems like most are 3/8". I think the reason the adapter leaked on one of them is because I was in a hurry and messed up the rubber o-ring that came with the adapter. Is that what makes the actual tight seal connection?

 

[Terry]

Without seeing what you have, I can say that if there is an O-Ring there, they are used as seals.
No tape is needed for those, or for compression connections.

Many new faucets are coming with their own supplies made to fit 3/8" compression stops.
This one below fits 1/2" copper (5/8" OD) with a 3/8" compression outlet.

 

[Sponsor]

 

[Jadnashua]

FWIW, in a home, a kitchen faucet is flow restricted, so 3/8" works fine.

 

[Reach4]

Now you have easier-to-operate stop valves. So nice upgrade.