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Rick
Rick, Construction Supervisor
Category: Plumbing
Satisfied Customers: 21525
Experience:  Licensed Master plumber with 40+ yrs. experience.
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How do I determine bathroom sink water supply valve connection

Customer Question

How do I determine bathroom sink water supply valve connection type and size?
Submitted: 5 years ago.
Category: Plumbing
Expert:  Rick replied 5 years ago.

Rick the plumber :

Welcome to Just Answer, I will do my best to help you solve your problem

Rick the plumber :

Virtually all compression stops to bathroom sinks are 3/8" OD compression connections

Rick the plumber :

This is the standard size for most braided sink supplies

JACUSTOMER-zvo45efk- :

3/8" compression nut is too small

Rick the plumber :

Then you have a real odd ball shut off. Probably best to just replace it with a standard 3/8" compression stop. The only sink supply sizes available are 3/8" and 1/2"

Rick the plumber :

I've been doing this for 40+ years and I've never seen a compression stop that wasn't 1/2" or 3/8"

JACUSTOMER-zvo45efk- :

I just purchased a7/16" compression braided supply line from Home Depot

Rick the plumber :

It's not even listed on their website

Rick the plumber :

in fact 7/16 isn't even a standard copper tubing size or compression fitting size

Rick the plumber :

you're trying to fit a square peg in a round hole, like I said before just replace the stop with a standard size

Rick the plumber :

you are in the States?