Lochinvar & A.O. Smith 100171950 Valve Freon Precise Fitment: Engineered to match

Precise Fitment: Engineered to match the four-bolt valve bracket pattern for the Model 21-27 series

Most failures occur due to improper leveling

a full valve replacement often isn't necessary

provided the system is configured to the manufacturer's specific water heater pressure switch settings

though mounting with terminals facing downward is recommended to prevent debris accumulation on the contact points

Lochinvar & A.O. Smith 100171950 Valve Freon Precise Fitment: Engineered to matchThe Lochinvar & A. O. Smith 100171950 Valve is a critical OEM replacement gas valve kit engineered specifically for Lochinvar Knight WH399 wall mount boilers. This high precision combustion control assembly includes the gas valve, venturi gasket, and necessary hardware to ensure a zero governor manifold pressure environment. As a veteran grade commercial boiler part, it regulates fuel flow based on the negative pressure signal generated by the blower,