Vacuum Relief Valve; Inlet Size 3/4 Inch; End Connection Male Threaded; Body Material Brass; Spring Material 302 Stainless Steel; Disc Material Silicone; Temperature Rating 250 Deg F; Pressure Rating 15 PSI; Inclusions/Features Protective Cap, Low Pressure Steam; Application Domestic Water Heater, Table Top Heater, Jacketed Steam Kettle, Unit Heater, Steam Coil Heater; Applicable Standard ANSI Z21.22, CSA; Lead-Free