... life Our air operated diaphragm pump is different from most of other Chinese pump for well mannfactured, well seal and good dry suction ... type air valve, low maintenance, low air consumption, so the using cost is low.Wetted body: PPH, PVDF, SS304, SS316, Aluminum ... material, keep the ball is very round for well seal, Strengthen the pump structure, produce good diaphragm for long service time.We ...