TD-11B series high-quality Automatic Fueling Nozzles are designed specially for self-service prepay or card-lock system to help prevent gasoline spills. It can not be opened until the pumping system is pressurized and closes automatically when the pressure is removed. This means the TD-11B series nozzles are closed when placed back in the dispenser storage position. Specification: Outer Dia. 13/16" 15/16" Connection Thread: NPT3/4" BSPT3/4" Origin China