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The NABIC 500 High Lift Safety Valve is designed for unvented hot water heating systems needing high-capacity steam relief. It features dezincification-resistant materials for all wetted parts, ensuring durability. This valve meets BS EN ISO 4126-1 standards and is WRAS approved for 1 bar and above. It offers a range of sizes with a resilient PTFE seating design for tight sealing. The valve allows easy inspection and cleaning with diaphragm-protected components, locked and sealed pressure settings, and a drain plug. It measures 1 1/2 x 2 inch and is suitable for unvented hot water systems. An optional Viton seat design is available. The padlock option complies with M&E3 standards.. Nabic 1 1/2 inch 500 High Lift Safety Valve - 6.5 Bar Brass N-500-040-6.5