Which is more common: 1/2" or 3/8" couplers?

[blb078]

Yep is a jic. What female end works with that. I can't seem to find any locally.

 

[kennyd]

None most likely, you'll probably need a JIC to NPT adapter.

 

[LD1]

Are you looking for a coupler to thread on there? If so, you will need adapters as kenny mentioned. That Tee is made to have a hose go on there. And JIC female hose ends are probably the most common end you will find. Usually the cheapest too.

If you want to thread on the couplers directly....you need an adapter like this 6505 | Male Pipe x JIC 37° Swivel Nut

 

[jenkinsph]

Those are ISO 7241 "B" couplers not "AG"
The ones at TSC are probably the "A" or "AG" style and if so are not compatible.

I agree, notice the front end of the male fitting is longer on "B" couplers sets.