I've a jet in my pool that is on it's own pump line; that is I can valve the pump to run only through that jet. It's in the main pool and has an odd thread size. It's neither 1/2 or 3/4 NPT, it's between them. I'm planning to use it for aeration with a little simple piping hooked up to make a fountain.
What are these odd threads? What do you think the jet was originally for? The pool was built in 1968 and is a lazy L if that helps to guess the original purpose.
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