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The NABIC 500 high lift safety valve is ideal for unvented hot water heating systems needing high-capacity emergency steam relief. All wetted parts resist dezincification. It meets BS EN ISO 4126-1 and WRAS standards (1 bar and above). The valve features a resilient PTFE seat for tightness and has a locked and sealed pressure setting. It offers easy inspection and cleaning, high discharge capacity, and diaphragm-protected parts. Features include a 3/4'' x 1'' size, Viton seat design option, and a padlock option that complies with M&E3.. Nabic 3/4 inch 500 High Lift Safety Valve - 1.8 Bar Brass N-500-020-1.8