The 55295 E-ChemSaver Air Shut off is a solenoid actuated shutoff compatible with a wide range of Teejet nozzle bodies equipped with a diaphragm check valve. It can be used for end of boom nozzles as well as individual tip shutoff and PWM controls. -Valve is normally closed and opens when solenoid is energized. Air pressure is used to open the valve and a spring is used to close the valve. Wetted materials include polypropylene. 55295 E-ChemSaver Air Shut off is very effective.