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Designed and tested to BS6759, this 500T combined pressure and temperature relief is manufactured by Nabic. This product has a gunmetal body and a diaphragm of silicon rubber., as well as a variety of options to suit many needs.Features & Benefits: Nabic 1 1/4 inch 500T Combined Pressure and Temperature Relief Valve - 1.8 Bar, Male BSP Inlet x Female BSP Outlet, Diaphragm: Silicon Rubber, Viton Disk, Gunmetal Body. Nabic 1 1/4 inch 500T Combined Pressure and Temperature Relief Valve - 1.8 Bar Brass N-500T-025-1.8