Attwood's self priming washdown pump generates steady water pressure for cleaning boats, general use, or use as a shower pump. Features threaded male inlet and outlet for standard garden hose attachment. Pumps 4 gallons per minute and produces up to 7.5 psi pressure. The pump accepts 3/4 inch (19mm) hose fittings. All connections must be airtight to maintain prime. Use reinforced suction hose to prevent kinking and collapsing.