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This NABIC 500 high lift safety valve is designed primarily for use on unvented hot water heating systems, where a high capacity, emergency steam relief capability is required. All wetted parts are manufactured from dezincification resistance materials. Designed and tested to BS EN ISO 4126-1 and WRAS approved (1 bar and above), this safety valve has a resilient PTFE seating design with a high degree of seat tightness and a locked and sealed pressure setting. Offering easy inspection and cleaning, this safety valve has a high discharge capacity and diaphragm-protected parts. Features & Benefits: Nabic 3/4 inch 500 High Lift Safety Valve - 6.0 Bar, x 1, WRAS approved (1 bar and above), Pressure setting locked and sealed, For use on unvented hot water heating systems, Diaphragm protected parts, Resilient PTFE seating design, High discharge capacity, Easy inspection and cleaning, Available with Viton seat design, Padlock available (complies with M&E3). Nabic 3/4 inch 500 High Lift Safety Valve - 6.0 Bar Brass N-500-020-6