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This extremely versatile safety valve is suitable for use with hot water, steam or air. Although designed primarily for the protection of hot water boilers, its compatibility with a wide range of applications makes it an ideal general-purpose safety valve. Ensuring easy inspection and cleaning, this safety valve features a drain plug fitted on sizes DN40 and above and a resilient PTFE seating design with a high degree of seat tightness. Features & Benefits: Nabic 2 1/2 inch 542 Safety Valve - 4.2 Bar, 2, Resilient PTFE seating design, Suitable for use with hot water, steam or air, High degree of seat tightness, Extremely versatile, Easy inspection and cleaning, General purpose, Drain plug fitted, For the protection of hot water boilers. Nabic 2 1/2 inch 542 Safety Valve - 4.2 Bar Brass NAB54206542