Description: The 33-Series is our general-duty on-demand positive displacement pump. It provides reliable performance in high water flow, moderate pressure applications. This 3-chamber diaphragm pump provides up to 3.0 gallons per minute and is capable of self-priming up to 6vertical feet, and can run dry without damage. Serves 3 or more 1/2 ” (13 mm) outlets. This automatic demand water system pump has a built-in pressure switch, which automatically starts and stops when the faucet is opened and closed. They're easy to install, service and winterize. Specification: Voltage: 24 vdc Size(L x W x H): 27cm x 14.5cm x 13cm/10.6" x 0.57" x 0.51" Inlet/ outlet: 1/2" threaded npt (1/2" barbed hose adaptors also included) Shut-off pressure: 3.1 PAR 11.6L/min Approvals: CE RV automatic demand pump Quiet performance Self priming Easy installation Runs dry without damage Built-in check valve Fittings included for 1/2 hose Package Includes: 1 Piece Diaphragm Water Pump