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The NABIC 500 high lift safety valve is ideal for unvented hot water heating systems needing high-capacity steam relief. Made from dezincification resistant materials, it meets BS EN ISO 4126-1 standards and is WRAS approved. It features a resilient PTFE seating with tight seal and a locked, sealed pressure setting. This valve allows easy inspection and cleaning. It has a high discharge capacity and diaphragm-protected components. The valve can be padlocked, complying with M&E3 standards, and is also available with a Viton seat design. Perfect for emergency steam relief with reliable performance. Nabic 1 inch 500 High Lift Safety Valve - 3.0 Bar. Nabic 1 inch 500 High Lift Safety Valve - 3.0 Bar Brass N-500-025-3