Double insulated motor. Runs 100° cooler for longer life. Heavy 5/16" stainless steel shaft. Housing of heat-resistant resin. 12-volt, 7 amps. Height: 6", width: 4 1/4", weight: 2 lbs. 10 oz. Switch adapter. Hose: 1 1/8" diameter. Thru-hull fitting: 1 1/8" diameter.