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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. Made from dezincification-resistant materials, it meets BS EN ISO 4126-1 standards and is WRAS approved for 1 bar and above. It features a PTFE seating design for tightness and easy inspection and cleaning. Its diaphragm-protected parts and locked pressure seating ensure reliability. It has a high discharge capacity, a fitted drain plug, and is available in sizes like 1 1/2'' x 2''. It also comes with an optional Viton seat design and a padlock that meets M&E3 compliance.. Nabic 1 1/2 inch 500 High Lift Safety Valve - 5.0 Bar Brass N-500-040-5