The Lennox 29M85 (also identified as 29M8501) is a critical Gas Valve LP Spring Kit engineered for high-precision fuel regulation in residential and light commercial HVAC systems

Precision-machined for a high-tolerance fit

and the necessary center mounting screw for a complete installation

What does a Class 2 rating mean for this installation

eliminating the need for field modifications

Schneider Electric (Barber Colman) N800-9423 Diaphragm The Lennox 29M85 (also identifiedThe Schneider Electric (Barber Colman) N800 9423 Diaphragm is a critical replacement component engineered for the 2473 Series pneumatic actuators. This 3 inch pneumatic control diaphragm is designed to restore precise pressure regulation in commercial HVAC systems, ensuring accurate stroke and force for optimal damper and valve positioning. As a direct 21 841 diaphragm replacement, the N800 9423 maintains the same form, fit, and performance