Always verify the part number in your unit’s service manual before installation

Durability: Engineered for high-temperature resilience in 90%+ AFUE furnace applications

Standard Pipe Sizing: Features 1/2" NPT inlet and outlet ports for compatibility with standard black iron gas lines common in HVACR installations

even in compact air handler cabinets

While the switch is factory-set for deck-level installations

Maxitrol M611-1 Valve THPU32HP7Y Always verify the part numberThe Maxitrol M611 1 Valve is a high precision 1" NPT modulating gas valve engineered specifically for direct fired burners operating in negative pressure (pull through) environments. As a veteran technician, you know that managing combustion in makeup air systems and industrial ovens requires stable, non oscillating control. This Maxitrol Selectra valve utilizes a specialized counter spring design to ensure the valve remains closed against the