The OPW 7HB Series high-quality diesel automatic shut-off nozzle is designed specifically for self-service prepay or card-lock systems to help prevent diesel fuel spills. The OPW 7HB cannot be opened until the pumping system is pressurized, and closes automatically when the pressure is removed. This means the OPW 7HB is closed when placed back in the dispenser storage position. These diesel nozzles are available in the following colors black, green, and yellow. OPW 7H nozzles have a 1" NPT inlet and a 1 3/16" O.D. spout.