ensuring precise seating and stroke alignment

or audible clicking without successful flame establishment

or an undersized duct system causing the unit to trip the 71W43 limit

the 25-601-00 comes standard with a 1/4" needle drain in the lower arm

general-purpose use

Lennox 21V12 Gas Valve 321142-301 ensuring precise seating and strokeThe Lennox 21V12 Gas Valve is a critical regulatory component engineered for high performance gas flow control in residential and commercial heating systems. This 24V slow open gas valve, often cross referenced as Lennox 105155 05 or White Rodgers 36G24 229, features a 1 2 inch NPT inlet and outlet for standard piping compatibility. Designed with high temperature resistance and a robust actuator, it ensures stable and precise natural gas regulation