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its called a male 90 (at least around here). they are very expensive compared to a close nipple and a street 90. Never seen one used, just on display in a supply house.

I agree, you need a pressure tank in the system, I recomend putting one in no matter what you want to to with it. When you buy it you have to make sure that the pressure in the tank is 2psi lower than the bottom set pressure dof your switch, assuming you have a 30-50 pressure switch you need to...

Its a little hard to tell you wish the problem might be without knowing exactly what drain you are installing and how it looks. The only thing I noticed that might me missing in your steps is the tightening of the but that is below the big rubber washer. Generally on the plastic lav drains...