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This Nabic 542 safety valve is highly versatile and designed for a range of applications, including hot water, steam, and air. It is ideal for protecting hot water boilers but serves as an excellent general-purpose safety valve. The valve supports easy inspection and cleaning. Models DN40 and above come with a fitted drain plug. The resilient PTFE seating ensures a tight seal for maximum reliability. This safety valve combines durability with practicality, making it a valuable addition to any system requiring precise safety measures.. Nabic 1 inch 542 Safety Valve - 4.0 Bar Brass NAB54202540