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The NABIC 500 high lift safety valve is for unvented hot water heating systems needing high-capacity emergency steam relief. All wetted parts are made of dezincification-resistant materials. It's designed and tested to BS EN ISO 4126-1 and WRAS approved. It features a resilient PTFE seating design with high seat tightness. The pressure setting is locked and sealed. The valve is easy to inspect and clean, with high discharge capacity and diaphragm-protected parts. It's WRAS approved (1 bar and above) and available with a Viton seat design. Sizes are 1/2'' x 3/4'' and a packlock option complies with M&E3.. Nabic 1/2 inch 500 High Lift Safety Valve - 0.8 Ba Brass N-500-015-0.8