Long lasting performance that operates quietly. Designed for long life and dependable performance, AQUA KING II freshwater automatic demand pumps feature quiet operation, are thermally protected and can run dry without damage. 3gpm model boasts a unique, over-molded, single-piece diaphragm for extended life in marine applications. 4 independent chambers and an internal bypass create extra-smooth flow with no rapid cycling. Pumps include two 1/2" barb fittings for hose. For more detailed technical information and installation guidelines, see the owner's manual and data sheet linked below. Key Features Automatic demand pump for freshwater systems 4 independent chambers and internal bypass for smooth flow without cycling Unique co-molded Santoprene diaphragm for longer service life Can run dry without damage Built-in check valve Self-priming up to 6' Ignition protected Dimensions: 8 3/16"L x 5"W x 4 1/8"H Owner's Manual Data Sheet 12V VersionData Sheet 24V Version