If your bathtub overflow drain is leaking, you should address it immediately to prevent hidden water damage behind the wall. Unscrew the two bolts on the overflow faceplate, pull the metal plate and linkage out, and inspect the black rubber gasket behind the tub. If it is flattened, cracked, or deteriorated, replace it with a new tapered rubber gasket. For an exterior watertight seal, apply a bead of 100-percent silicone caulk around the upper perimeter of the faceplate. Callout type="warning" title="Hygiene Warning": Ensure the lower gap of the faceplate remains uncaulked so accidental overflow water can still drain safely. Verification: Pour a bucket of water down the overflow opening and inspect behind the wall to confirm zero leaks.
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