The Aquatec 550 Series Pumps can self prime water from a holding tank and pressurize it or boost pressure from a low pressure source. These pumps are made to operate intermittently but can run for several hours at a time. It can be operated in delivery mode by an external power switch or demand mode with an integrated pressure switch.Specifications: 5 GPM 60 PSI pressure 1/2" Female NPT (fittings not included) 5-chamber construction Closed impervious diaphragm Independent symmetrical valves Highest structural integrity Ten point clamping Engineered composite plastics Corrosion resistant metalBenefits: Self-priming Unparalleled performance, efficiency Whisper quiet at lower flows Minimal pulsations 7 year design life Runs dry without damage Chemically resistant versions