Smart Sensor Variable Speed Water Pump silently delivers up to 4.0 gallons of water per minute with pressure up to 65 PSI. Provides smooth water flow just like at home, without sacrificing water pressure or volume. Smart Sensor micro-processor directs rate of flow and also provides over/under voltage protection; eliminates the need for pressure switch and accumulator tank. No cycling, no pulsing, operates silently at any flow level. 1/2" MPT inlet and outlet fittings. DO NOT USE EXTREME STRAINER 254 WITH THIS PUMP! Shurflo 255 In-Line Strainer recommended for installation; Look under category "Water Filters."