a 1/2" hub bore

OEM Precision: Direct factory fitment ensures mounting standoffs and wiring harnesses align perfectly with existing G50 and G1 cabinets

leave the unused port open to the atmosphere

Proper installation requires a calibrated manometer to set the 10" W

Lochinvar & A.O. Smith 100233617 Gasket 321702-401 a 1/2" hub boreFor veteran technicians servicing high capacity Lochinvar Knight boilers or A. O. Smith water heaters, the 100233617 Gasket is a critical component for maintaining combustion integrity. Engineered as a large gas air arm cover gasket, this seal is primarily utilized in the gas air arm assembly to prevent dangerous fuel air mixture leaks. This specific part is a direct OEM replacement for legacy part numbers GKT20019, GKT20019K, and 100146349. Measuring