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I replaced my loader upper quad manifold with 4-3/8JIC x 1/4 NPT fittings and 4- Stucchi FIRG part STU 800801000 flat face connectors. No more leaks and the bucket stays un now.

If you are talking about the couplers that connect the loader to the tractor (quad manifold) you can leave the tractor quad on the tractor and discard the top (loader quad) .Here is a list of comparable flat face (female end) couplers that will interchange (connect) to the quad manifold tractor end.

I have a kubota BX1880 that I bought used (it was only one year old) and the quad connector didn’t leak a drop until I moved about 30 yards of dirt. After that it leaked whenever I moved the bucket. I saw a forum that a guy had a kubota 2380 and he removed the loader quad manifold and put on 4...