making it less susceptible to the thermal shock and mechanical vibration that often leads to premature failures in standard 120V ignition systems

Energy Efficiency: Helps maintain system SEER ratings to reduce monthly utility costs

Direct OEM Match: Fully replaces the legacy AP13156 model with no modifications required for 9-inch ducting and venting systems

secure fit during installation

and 325-9 Series regulators

Lochinvar & A.O. Smith 100289450 O-Ring R-407A making it less susceptible toThe 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