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The genuine Goodman 0154A00000BL drain pan gasket is the factory seal that mates the condensate drain pan to the coil assembly on the ATUF182416AA air handler. Though inexpensive, this small gasket does a critical job: it blocks condensate from seeping past the pan joint, preventing water on the cabinet floor, rust, and ceiling stains. Any time you pull a coil or replace a drain pan, the original gasket should be replaced rather than reused, since old foam compresses and loses its seal.
The OEM gasket is die-cut to the exact pan profile and built from material rated for constant moisture and the temperature swings inside an air handler. Generic foam or weatherstrip may fit roughly but can break down, compress unevenly, or fail to seal the corners — letting condensate weep through and undoing the repair. At this price, the correct OEM seal is cheap insurance against water damage.
Easy (1/5). With the pan or coil already accessible, peel away the old gasket, clean the mating surface, and press the new gasket into place before reassembly. Usually under 10 minutes. Make sure the surface is dry and free of old adhesive for a clean, full-perimeter seal.