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 in demand mode with an integrated pressure switch.Specifications:6 GPM60 PSI pressure1/2" Female NPT (fittings not included)5-chamber constructionClosed impervious diaphragmIndependent symmetrical valvesHighest structural integrityTen point clampingEngineered composite plasticsCorrosion resistant metalBenefits:Self-primingUnparalleled performance, efficiencyWhisper quiet at lower flowsMinimal pulsations7 year design lifeRuns dry without damageChemically resistant versions