System Reliability: Creates a robust seal for the bellows assembly

Broad Compatibility: Fits a wide range of Lennox Elite and Merit series furnaces

The circuit will close once the differential pressure rises above your setpoint

independent dry contacts for flexible system interlocking and signaling

making it a reliable replacement air vent for Weil-McLain boilers

Nordyne 664275R TXV 318518-761 System Reliability: Creates a robustThe Nordyne 664275R TXV is a critical N Series thermal expansion valve engineered specifically for 5 ton packaged units. Designed for R410A refrigerant, this OEM component provides precise metering to maintain the correct superheat across the evaporator coil, preventing liquid slugging and ensuring compressor longevity. As a direct Nordyne replacement part, it eliminates the compatibility issues often found with universal aftermarket valves,