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The NABIC 500 high lift safety valve is ideal for unvented hot water heating systems needing high-capacity steam relief. All wetted parts resist dezincification. It's designed and tested to BS EN ISO 4126-1 and WRAS approved for 1 bar and above. It comes in various sizes with a resilient PTFE seating design ensuring high seat tightness. Diaphragm-protected parts allow easy inspection and cleaning. The pressure setting is locked and sealed, featuring a drain plug and is available in 1 x 2. The valve is also available with a Viton seat design and a padlock compliant with M&E3. It provides a high discharge capacity, ensuring reliability in emergency situations.. Nabic 1 1/2 inch 500 High Lift Safety Valve - 3.5 Bar Brass N-500-040-3.5