1/2 inch Union Sweat Proportional Thermostatic Mixing and Diverting Valve DUAL CERTIFICATION ASSE1016-T AND ASSE1017, IAPMO APPROVED, CSA APPROVED CONSTANT WATER TEMPERATURE UNDER DIFFERENT OPERATING CONDITIONS, PROPORTIONAL VALVE(SIMULTANEOUS CONTROL OF HOT AND COLD WATER), ANTI-SCALD, ANTI-CHILL THERMAL SHOCK PROTECTION AT CORRECT SETTING.(EXCEPT R MODELS) EPDM O-RINGS, MAXIMUM WORKING PRESSURE 150 PSI(1034 kPa), MAXIMUM HOT WATER SUPPLY TEMPERATURE 212 DEGREES F (100 DEGREES C UNION SWEAT, UNION THREADED, AND NPT(FEMALE) CONNECTIONS AVAILABLE 1/2" THROUGH 1" MADE IN USA