Double stack water systems are high flow (9 GPM, 34 LPM) for up to 7 outlets. Combines two pumps assembled onto a pre-pressurized accumulator tank to smooth flow and prevent pump cycling. Self-priming up to 6-10'Run-dry abilitySmooth, even flowTwo stage operationInternal bladder accumulator tankThermal overload protectionComplies with ISO 8846 MARINE (Ignition Protection)Connections for 3/4" hose tail