Description The OPW 7H-0900 is low-cost, has a long life and is very durable. Key Features Prevents gasoline spills in prepay or card-lock systems utilizing OPW's unique No Pressure - No Flow Device. The nozzle cannot be opened until the pumping system is pressurized, and closes automatically when the pressure is removed. Prevents consumer from jamming the nozzle in an open position - blocker on lever guard. Low reliable shut-off -- specifically designed to ensure proper automatic shut-off as low as 5 gallons per minute. Durable lever guard that won't scratch your customers' vehicles -- made from Duratuff. New hold-open clip spring lasts longer than previous designs.