To replace a bathtub overflow plate and gasket, remove the old overflow plate, pull out the worn gasket, clean the opening, install the new gasket in the same position, then fasten the new plate and test the tub for leaks.
This repair is usually worth trying when water shows up behind the tub wall or below the bathroom only when the water level reaches the overflow opening. The job is straightforward, but take your time so the gasket seats evenly and the screws do not strip.
Before you start: Match the overflow plate shape, screw spacing, gasket profile, and trip lever style before ordering. Stop if the overflow body moves, the opening is cracked, mounting points are stripped, or water damage appears behind the tub.
This job fits leaks that show up only when water reaches the overflow opening. Other tub leaks need a different repair path.
This page fits when: Water appears only when the tub level reaches the overflow opening, and the plate or gasket looks loose, cracked, flat, or hardened.
Check something else when: For leaks below the overflow level, inspect the drain shoe, supply lines, or wall plumbing instead.
This page fits when: The new plate matches screw spacing, opening shape, gasket profile, and trip-lever style.
Check something else when: If the old plate is missing or the linkage style is unclear, identify the waste-and-overflow assembly before buying.
This page fits when: The overflow body stays solid, mounting points hold, and no soft wall, rot, or active leak appears behind the tub.
Check something else when: If the overflow body moves or the wall cavity is wet, a plate-and-gasket swap is not enough.
The overflow gasket has to sit flat behind the tub wall, and the plate has to tighten evenly without pulling the overflow body loose.
Use it for: Removes and reinstalls most overflow plate screws.
Shop Phillips screwdrivers
Use it for: Helps ease out an old stuck gasket without damaging the tub finish.
Shop pry tools
Use it for: Lets you see the overflow opening and check gasket position clearly.
Shop flashlights
Use it for: Wipes away soap film, old residue, and water before installing the new gasket.
Shop cleaning cloths
Use it for: Cleans the tub surface and overflow opening so the new gasket can seat flat.
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If it works: The leak appears when water reaches the overflow, which points to the overflow plate or gasket.
If it doesn’t: Leaks appear even when the water level stays well below the overflow. This repair may not solve it, so check the drain shoe, waste-and-overflow connections, or nearby supply plumbing instead.
If it works: The old overflow plate is off and the opening is exposed.
If it doesn’t: The plate will not come free. Check again for a hidden screw or paint buildup around the edges, then work it loose gently instead of forcing it.
If it works: The old gasket is out and the overflow opening is clean and ready for the new part.
If it doesn’t: Brittle gasket pieces break apart. Keep removing the remaining pieces until the sealing surfaces are fully clean.
If it works: The new gasket is seated evenly and the plate lines up with the mounting holes.
If it doesn’t: Screw holes do not line up or the gasket keeps shifting. Remove it and recheck the gasket orientation and part fit before tightening anything.
If it works: The overflow plate is secure, centered, and snug against the tub.
If it doesn’t: Plate movement, crooked seating, or uneven tightening shows up. Back the screws out and reseat the gasket and plate.
If it works: No water appears around or behind the overflow while the overflow is taking water, so the repair is holding.
If it doesn’t: Leakage remains after the test. Remove the plate and check for a twisted gasket, wrong gasket profile, loose mounting, or damage deeper in the overflow assembly.
Match screw spacing, plate shape, gasket profile, and trip lever style before ordering.
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Not always, but it is often the easiest way to get a clean fit and fresh hardware at the same time. If the plate is rusted, bent, or the screws are worn, replacing both parts makes sense.
That usually points to the overflow opening. Water does not reach that part of the tub until the level gets high enough, so a bad overflow gasket often leaks only during deep fills.
It is better to replace it. Old gaskets flatten, harden, or crack over time, and they often stop sealing well once disturbed.
Usually no. The gasket behind the plate is what makes the seal. Caulk on the face of the plate can hide a bad seal instead of fixing it and can make future repairs messier.
You can still do this repair, but remove and reinstall the plate carefully because a linkage may be attached behind it. If the linkage is badly rusted or jammed, the repair may need to go beyond the plate and gasket.
Repair Riot uses related bathtub leak and overflow pages to keep this repair focused on gasket fit, plate alignment, leak testing, and stop conditions.