To seal a bathtub overflow drain to prevent leaks or perform a pressure test, you must service the rubber gasket behind the tub wall. Unscrew the two bolts on the overflow faceplate, pull the metal plate and linkage assembly away, and inspect the black rubber washer. If it is deteriorated, replace it with a new tapered rubber gasket. For an exterior watertight seal, apply a bead of 100-percent silicone caulk around the perimeter of the faceplate. Callout type="warning" title="Hygiene Warning": Ensure the overflow pipe remains unobstructed so the tub cannot accidentally overflow during normal baths. Verification: Pour water around the sealed faceplate and inspect behind the wall to confirm zero leaks.
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