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This versatile Nabic 3/4 inch 542 Safety Valve is suitable for hot water, steam, or air, making it a reliable choice for various applications. Primarily designed to protect hot water boilers, it also functions effectively as a general-purpose safety valve. The resilient PTFE seating design ensures easy inspection, cleaning, and a high degree of seat tightness, providing long-lasting performance. Rated at 3.9 Bar, this valve offers dependable protection for hot water systems and is ideal for safeguarding boiler installations.. Nabic 3/4 inch 542 Safety Valve - 3.9 Bar Brass NAB54202039