the 998-0510-97 is the manufacturer-specified direct replacement for the discontinued 998-0510-42 part number

This specific model features Buna-N seals rated for air and water

Its internal pilot-operated diaphragm design ensures reliable shut-off and venting under a 0-25 PSI pressure range

and pressure vessels

This factory-authorized kit provides the necessary hardware—including bulb insulation

Lochinvar & A.O. Smith 100111058 Outlet Switch 322055-301 the 998-0510-97 is the manufacturer-specifiedMaintain the safety and operational integrity of commercial water heating systems with the Lochinvar & A. O. Smith 100111058 Blocked Outlet Switch. This genuine OEM safety control is engineered to monitor exhaust vent conditions in high efficiency appliances, including the BTH, SUF, and HCG Series. Functioning as a critical pressure sensing switch, it detects obstructions in the exhaust path and immediately triggers a system shutdown to prevent the