(1)
Temperature-relief, pressure-relief, combined temperature- and pressure-relief and vacuum-relief valves shall conform to ANSI Z21.22 / CSA 4.4, “Relief Valves for Hot Water Supply Systems.”
Temperature-relief, pressure-relief, combined temperature- and pressure-relief and vacuum-relief valves shall conform to ANSI Z21.22 / CSA 4.4, “Relief Valves for Hot Water Supply Systems.”