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This Nabic 542 safety valve is extremely versatile. It is suitable for use on hot water, steam or air. The design is intended primarily for the protection of hot water boilers, but its wide range of applications ensures that it is a perfect general purpose safety valve.Features & Benefits: Nabic 1 inch 542 Safety Valve - 2.7 Bar, Easy inspection and cleaning, Drain plug fitted on sizes DN40 and above, Resilient PTFE seating design with high degree of seat tightness, Versatile. Nabic 1 inch 542 Safety Valve - 2.7 Bar Brass NAB54202527