The nozzle can not be opened until the pumping system is pressurized and closes automatically when the pressure is removed.

ZZN-11B Automatic nozzle is designed specially for self-service pre-pay of card-lock system to prevent gasoline spills.The ZNN-11B automatic nozzle can  not be opened until the pumping system is pressurized and closes automatically  when the pressure is removed. This means the ZZN-11B is closed when placed back to the fuel dispenser.

Technical Specifications:
Inlet thread: BSP3/4"/NPT3/4"/G3/4"   
Diameter of spout: 13/16" and 15/16"            
Working Pressure: 0.18Mpa        
Color of insulator: red/green/blue/yellow/black/gray