Leaking coupler

PedeStablesEden · 2026-03-26T21:34:00-0400

Ok, so I just installed a manual diverter valve. All the couplers and fittings were that bspp or bssp thread i forget the exact acronym. The implement hoses wet all npt threads. So i ordered a set of quick connects from Amazon in the correct 1/2 npt thread. When i connect them they seemed lose and I was right, they leaked like a siv!! When i hook up the male ends that came with the diverter valve they are tight in there. The diverter has all female couplers. Are the quick connect male and female side different from 1/2G to 1/2npt? I don't think so but I'm not sure. I'm thinking the Amazon ones were junk. Someone please help me as I'm about to burn this tractor to the ground at this point lol.

Tinhack · 2026-03-26T21:58:38-0400

1/2G and 1/2NPT are not the same. Nor is BSPP and NPT. The "G" threads are BSPP and are straight threads where the NPT usually has less threads and are tapered threads. Get the correct fittings or they'll all leak.

PedeStablesEden · 2026-03-27T11:06:54-0400

Tinhack said:
1/2G and 1/2NPT are not the same. Nor is BSPP and NPT. The "G" threads are BSPP and are straight threads where the NPT usually has less threads and are tapered threads. Get the correct fittings or they'll all leak.

Not what i asked lol, I know there is a difference in threads, I'm asking about the other end of the fitting. I have two sets of quick connects, one threaded with bspp, the other npt. Are the female part that accepts the male part where they push together both the same? My female connector is bspp, the male end on the line is npt, should they connect together fine?

oldnslo · 2026-03-27T13:28:24-0400

If the connectors are the same series or style then yes the nipple and coupling should be the same irregardless of thread size or style.

You may have to confirm they are same series since I think some will look very similar and connect but they are not the same and will leak