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: 45 psi demand pump Used in delivery and transfer applications up to 3.5 gpm NSF Listed Prevents back flow of fluid through the pumps Automatic shut-off Can run dry without damage