3/8" compression fitting to 1/4" push connect - does a fitting exist?

Reefpuck · Sep 22, 2018

I have a 3/8" compression valve (male thread - exactly like picture below)...that I want to connect my 1/4" RO line to. I cannot find a fitting for the life of me at HD/Lowes...or online. I would think this is a pretty common fitting.

Can anyone shed some light on me?

HiddenReefer · Sep 22, 2018

They definitely exist. Freely available in South Africa where I am from. Have you tried BRS?

bblumberg · Sep 22, 2018

It might be easiest to put a short length of 3/8 into the compression fitting, then use a 3/8 to 1/4" John Guest or similar push fit adapter to connect the 2...

Fishfinder · Sep 22, 2018

That would not be an easy to find fitting (if there is one). Compression fittings have different threads. I dont know of any fittings that have female compression threads

Reefpuck · Sep 22, 2018

bblumberg said:
It might be easiest to put a short length of 3/8 into the compression fitting, then use a 3/8 to 1/4" John Guest or similar push fit adapter to connect the 2...

That actually sounds like a good idea! I will give that a shot.

Reefpuck · Sep 22, 2018

Fishfinder said:
That would not be an easy to find fitting (if there is one). Compression fittings have different threads. I dont know of any fittings that have female compression threads

Yeah that's what I've found out. I thought maybe I could find some sort of adapter to convert from compression to the standard thread, but again struck out on that.

Fishfinder · Sep 22, 2018

You would be best going from that 3/8 to a reducing compression fitting or a reducing john guest fitting. I would use stainless 3/8 to the reducer to give a cleaner look and more rigidity