Field-Adjustable Range: Set point flexibility from 0

50" WC pressure switch designed specifically for Lennox

Durable Construction: Built with a die-cast aluminum body and nitrile (NBR) elastomers for maximum resistance to fuel gas chemical profiles

Whether you are performing a steam boiler pressure control replacement or a new install

While optimized for KMC VEZ valves

Mueller Industries A17939 Check Valve 323613-751 Field-Adjustable Range: Set point flexibilityThe Mueller Industries A17939 is a high performance 7 8" Magnetic Check Valve designed for critical backflow prevention in commercial refrigeration and air conditioning systems. Engineered with a hermetically formed solid copper body, this valve eliminates potential leak paths, ensuring system integrity under high pressure conditions up to 800 PSI (55 bar). The internal magnetic mechanism provides a positive seal with a minimum pressure differential