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It's a single stage (one impeller) 1/2 hp Teel convertible jet pump circa 1993. The parts list when rebuilt listed two parts as "diffuser". One was the actual plastic diffuser that surrounds the impeller the other was a rubber ring that the diffuser mounted to the suction of the pump head...

When rebuiilt, the impeller and diffusers and o-rings were replaced. Didn't do the seal since it wasn't leaking and the carbon ring looked fine. I got a different pump from a friend and hooked it up with the same result though. The ejector is new and the nozzle and venturi are the same size...

Have a 1/2 HP convertible two pipe jet pump deep well application. 90'. Pressure set for 20-40. Pump won't build pressure past 23 psi and won't push water into bladder tank. 18 psi air pressure in bladder tank without water or water pressure in tank. Pump has trouble priming but eventually...