The DPHC-T33 Series is our general-duty on-demand positive displacement pump. It provides reliable performance in high water flow and moderate pressure applications. This 3 chambers diaphragm pump provides up to 4.0 gallons per minute and is capable of self-priming up to 9.8 ft. (3.0 m) vertical height, and can run dry without damage. This automatic demand water system pump has a Built-in pressure switch automatically starts and stops the pump instantaneously when the discharge valve opens and closes. Easy to install, service and winterize with quick detachable connectors. Built-in pressure switch automatically starts and stops pump instantaneously when discharge valve opens and closes. Can run dry for extended periods of time without damage and handle liquids up to 140 F (60 C). Ball bearing drive throughout pump and motor assures longer pump life. Automatic control switch of the pressure inside and motor is thermally protected. Excellent self-priming capability up to 9.8 feet suction lift. Powerful, permanent magnet motor with low current draw and long life brushes. This diaphragm water pump install easily and great use in garden, RV, yacht agricultural irrigation spraying and kitchen. Also the best partner of food trunk and fish tank.