ShurFlo 2088 Series Delivery Pump flows up to 3.5 gpm and self primes. This pump is a fully automatic diaphragm pump, ideal for high-volume applications such as vending machines for both delivery and reservoir draining. The Pump activates automatically as line pressure drops and shuts off when a preset pressure is achieved.Features: 3.3 GPM flow rate 45 psi Demand Switch 1/2" - 14 Male Parallel Thread Ports Open Flow & Self-Priming (up to 9 vertical feet) Prevents back flow of fluid through the pump Can run dry without damage Ground wires w/ base plate NSF, UL and CSA listed