As a professional-grade OEM replacement for Lennox 51M33

This dimension is specifically calibrated for the larger combustion chambers found in the 400k through 600k BTU output units to ensure a comprehensive seal

High Temperature Resilience: Engineered specifically for steam and hot water applications using durable EPDM seals

Precision Calibration: Reliable 25 PSI open / 41 PSI close settings for accurate low-side monitoring

simply insert the provided skipper screws into the corresponding days on the 7-day skipper wheel located behind the 24-hour dial

Trane CNT3601 Control 319848-301 As a professional-grade OEM replacementThe Trane CNT3601 is a performance critical SPDT Defrost Control designed for precise thermal management in Trane and American Standard HVAC systems. Engineered with a setpoint range of 10 60F, this OEM replacement part ensures accurate defrost cycle initiation and termination, preventing indoor coil frosting during low ambient cooling or heat pump heating operations. The 52. 5 inch lead length provides the necessary reach for complex wiring harnesses