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The Goodman 0154A00000BL is a genuine OEM drain pan gasket that seals the condensate drain pan against the air handler cabinet on models including the WAHMS1931P4ACA. This gasket prevents condensate bypass and air leakage at the pan interface — a small part that plays a big role in keeping water in the pan and out of your cabinet, ductwork, and floor.
The OEM gasket is die-cut to the exact pan footprint and compression thickness, guaranteeing a tight, even seal. Generic gasket stock cut to size rarely matches the original profile, leaving gaps that allow drips and air bypass. The genuine part is inexpensive insurance against leak callbacks.
Easy. Power down the unit, remove the old gasket, clean the mating surface, and seat the new gasket before reinstalling the pan. Typically a 10–15 minute job and well within reach of most DIYers.