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Built for the rigors of mechanical rooms and warehouses
Is the A421AEC-02 a direct swap for the older A419 series
ensuring a drop-in fit for fast HVAC unit replacement
Field installation is streamlined by its compact form factor
800 in-lbs—a significant upgrade for heavy-duty drive systems
Lochinvar & A.O. Smith 100171948 Gas Valve Kit 326058-758 Built for the rigors ofThe Lochinvar & A. O. Smith 100171948 Gas Valve Kit is a critical OEM component engineered specifically for the Knight WH199 wall mount boiler and compatible high efficiency water heaters. This assembly serves as the primary regulator for fuel delivery, ensuring precise negative pressure gas valve operation required for clean combustion and stable flame signals. Designed to interface directly with the Smart System control board, the kit includes the