Standard lead lengths on the 2721 series are designed to reach terminal connections within standard burner housings

The Nor East Controls 30033673-001 is a 13-inch replacement diaphragm designed for Direct Acting (DA) pneumatic actuators

It features external pressure equalization via a 1/4-inch flare connection

The 1/2-inch bore is located on the intake side for standard mounting configurations on condenser motor shafts

ensuring accurate stem positioning and optimized flow control

Lochinvar & A.O. Smith 100109864 Blower Assembly 318518-761 Standard lead lengths on theThe Lochinvar & A. O. Smith 100109864 Blower Assembly is a direct OEM replacement engineered for high efficiency commercial water heaters and boilers. Designed to maintain precise air fuel ratios, this combustion blower motor ensures stable flame signals and optimal thermal output. As a critical component in the pre mix combustion system, it integrates seamlessly with the control board to modulate airflow based on demand, preventing short cycling and