Kitchen shutoff valve sizes

Users who are viewing this thread

GreekGuy7

Member
Messages
36
Reaction score
0
Points
6
Location
Illinois
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

The Plumbing Wizard
Staff member
Messages
29,942
Reaction score
3,468
Points
113
Location
Bothell, Washington
Website
terrylove.com
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.

brasscraft-shutoff.jpg
 

Jadnashua

Retired Defense Industry Engineer xxx
Messages
32,770
Reaction score
1,192
Points
113
Location
New England
FWIW, in a home, a kitchen faucet is flow restricted, so 3/8" works fine.
 

Reach4

Well-Known Member
Messages
40,196
Reaction score
4,736
Points
113
Location
IL
Now you have easier-to-operate stop valves. So nice upgrade.
 
Top
Hey, wait a minute.

This is awkward, but...

It looks like you're using an ad blocker. We get it, but (1) terrylove.com can't live without ads, and (2) ad blockers can cause issues with videos and comments. If you'd like to support the site, please allow ads.

If any particular ad is your REASON for blocking ads, please let us know. We might be able to do something about it. Thanks.
I've Disabled AdBlock    No Thanks