Needle Valve for Liquidator

[pjt]

I'd like to install a Hayward needle valve and I have 3/8" OD (1/4" ID) tubing. Which size valve should I order (1/4" or 3/8")? Thanks in advance!

 

[Bama Rambler]

It really doesn't matter. I used the ¼" NPT Hayward valve because I already had the 1/4" NPT to 3/8" tubing adapters.