12V, multi-fixture, automatic demand water pump operates at 40 PSI up to 2.8 gallons per minute. Shurflo's unique "Tri-A-Fram" pump has 3 independent pumping chambers for 3-way reliability. Design has no moving parts traveling more than 1/8". Inlet and outlet fittings are 1/2" MPT; Comes with 1/2" barbed adapters to fit most water systems. The most popular water pump in the RV industry. We highly-recommend the use of a Shurflo in-line filter with this pump; look under the category "Water Filters."