If your bathtub leaks underneath the basin whenever you drain water, the issue is typically caused by a deteriorated rubber washer beneath the drain shoe or a loose slip-joint nut on the P-trap. Inspect the piping beneath the tub using an inspection panel or flashlight. Tighten loose slip-joint nuts by hand or replace the rubber washer sandwiched between the underside of the tub and the waste shoe. Callout type="warning" title="Hygiene Warning": Place a bucket under the leak to catch dripping water and prevent subfloor rot. Verification: Fill and empty the bathtub to confirm that all joints underneath remain completely dry.
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