Yes, a bathtub drain can be completely replaced from above and behind without needing to pull out or remove the bathtub itself. Standard drain baskets, strainers, waste shoes, and overflow gaskets are designed to be accessed, unthreaded, and serviced directly from inside the tub basin or through a small access panel cut into the drywall behind the plumbing wall. Verification: Test the newly installed drain assembly with a full tub of water to ensure complete watertight integrity beneath the floor.
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