UNIVERSAL DESIGN: To be used with any system supplying compressed air, water or oil without disruption QUARTER-TURN VALVE: will not restrict flow and ensures full pressure coming through the valve NPT: 1/2" female national pipe threads MAXIMUM PRESSURE: Air/Water/Oil 400 PSI; Steam 150 PSI MADE IN USA Milton is your number 1 source for Quality Air Accessories Since 1943 Milton has been producing Quality Air Accessories Milton covers automotive, industrial, hardware, agriculture, heavy-duty fleet and MRO markets