Repairing a leaking bathtub overflow typically involves replacing the behind-the-wall rubber gasket. Unscrew the two faceplate bolts, pull the metal plate and linkage out, and reach behind the tub to remove the old rubber washer. Slide a new tapered rubber gasket onto the overflow elbow with the wide side facing the tub wall, reattach the faceplate, and tighten the screws evenly. Callout type="warning" title="Hygiene Warning": Shut off the main water supply if your repair involves cutting into supply or waste pipes. Verification: Pour a bucket of water down the overflow opening and check behind the wall to verify zero leaks.
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