Lochinvar & A.O. Smith 100289450 O-Ring 318172-701 Since this is a conventional

Since this is a conventional 4-wire device

ensuring stable control of hot water

This genuine OEM Lennox expansion valve is a precision-engineered thermostatic expansion valve (TXV) specifically designed for R410A refrigerant applications

this specific suffix (-204) is calibrated and labeled for vertical mount installation only

Lochinvar & A.O. Smith 100289450 O-Ring 318172-701 Since this is a conventionalThe Lochinvar & A. O. Smith 100289450 O Ring is a critical sealing component designed for high performance gas valve assemblies and burner systems. As an OEM gas valve gasket replacement, this heavy duty sealing ring is engineered from advanced synthetic rubber to provide a precision fit across various hydronic heating platforms. This specific part number, 100289450, serves as the direct replacement for 100288891, ensuring backward compatibility for