I have 4 jets in my in-ground spa. 2 of the little heads are broken off and 2 of them are fine. I would be okay with replacing the 2 broken ones but I can't find whatever part i'm going to need. The existing ones appear to be a 2 piece jet. One piece that slips into the return line (which appears to be 3/4" PVC) and another that threads onto the first piece (with what appears to be 1 1/2" threads). Does anyone recognize this kind of jet or know where I can find something to replace it with?