SEAFLO 33-Series Diaphragm Water PumpThe SeaFlo 33 Series is our general duty on demand positive displacement pump. It provides reliable performance in high water flow, and moderate pressure applications. This 3 chamber diaphragm pump provides up to 3. 0 gallons per minute and is capable of self priming up to 6 vertical feet, and can run dry without damage. Serves 3 or more 1 2 (13 mm) outlets. This automatic demand water system pump has a built in pressure switch, which automatically