3/4"" NPT STRAIGHT SHANK WATER MAIN VENT VALVE FOR USE ON HIGH PRESSURE HOT OR COLD WATER OR GLYCOL MAINS AND PROCESS APPLICATIONS TAPPED AT TOP FOR 1/8"" NPT SAFETY DRAIN CONNECTION FOR DISCHARGING MOISTURE BODY UNSCREWS FOR EASY CLEANING BUILT-IN CHECK VALVE MAX. OPERATING PRESSURE 150 PSIG MAS HYDROSTATIC PRESSURE 450 PSIG MAX. TEMPERATURE 250 DEGREES F.