Step-by-step fix
Step 1: Confirm the overflow gasket is the likely leak point
- Dry the tub wall around the overflow plate and, if you have access, dry the area behind the tub or the ceiling below.
- Run water into the tub until the level rises to the overflow opening, then let a little water enter the overflow for a minute.
- Watch for water showing up only when the overflow is taking water, not while the drain is simply open below the tub.
- Look at the plate for rust, looseness, missing screws, or a gap where the gasket may no longer be sealing.
If it works: The leak appears when water reaches the overflow, which points to the overflow plate or gasket.
If it doesn’t: If the tub leaks even when the water level stays well below the overflow, this repair may not solve it. Check the drain shoe, waste-and-overflow connections, or nearby supply plumbing instead.
Stop if:- You find active leaking from a cracked tub, broken piping, or severe hidden water damage behind the wall.
- The overflow assembly is badly corroded or loose inside the wall and does not feel secure enough for a simple plate-and-gasket replacement.
Step 2: Remove the old overflow plate
- Put a towel in the tub to protect the finish and catch dropped screws.
- Remove the screw or screws holding the overflow plate in place.
- Pull the plate straight out carefully. If your tub has a trip lever, ease the plate out slowly so you do not bend the linkage attached behind it.
- Set the old plate and screws aside so you can compare them with the replacement parts.
If it works: The old overflow plate is off and the opening is exposed.
If it doesn’t: If the plate will not come free, check again for a hidden screw or paint buildup around the edges. Work it loose gently instead of forcing it.
Stop if:- A trip-lever linkage is jammed, badly rusted, or falls apart as you remove the plate.
- The mounting area inside the overflow opening is cracked or too damaged to hold the new plate securely.
Step 3: Remove the old gasket and clean the opening
- Use your fingers or a flat screwdriver or plastic pry tool to pull the old gasket out from around the overflow opening.
- Note how the old gasket sat before removing it completely. Many overflow gaskets are thicker on one side, so orientation matters.
- Wipe the tub surface, the overflow opening, and the back side of the mounting area clean.
- Remove soap scum, old residue, and loose debris so the new gasket can sit flat against clean surfaces.
If it works: The old gasket is out and the overflow opening is clean and ready for the new part.
If it doesn’t: If the gasket is brittle and breaks apart, keep removing the remaining pieces until the sealing surfaces are fully clean.
Stop if:- You uncover heavy corrosion, a misshapen opening, or damage that prevents the gasket from sitting evenly.
Step 4: Install the new gasket in the correct position
- Compare the new gasket with the old one for size, shape, and thickness profile.
- Place the new gasket around the overflow opening in the same orientation as the original. If one side is thicker, position it to match how the tub and overflow elbow line up.
- Hold the gasket in place and make sure it is not twisted, folded, or pinched.
- If your replacement kit includes a new plate, line it up with the screw holes before starting the screws.
If it works: The new gasket is seated evenly and the plate lines up with the mounting holes.
If it doesn’t: If the screw holes do not line up or the gasket keeps shifting, remove it and recheck the gasket orientation and part fit before tightening anything.
Stop if:- The replacement parts clearly do not match the opening, screw spacing, or overflow style.
Step 5: Reattach the overflow plate without over-tightening
- If your tub has a trip lever, guide the linkage back into place carefully as you bring the plate to the opening.
- Start the screw or screws by hand so they thread straight.
- Tighten the screws evenly until the plate is snug and the gasket compresses enough to seal.
- Stop once the plate sits flat and secure. Over-tightening can distort the gasket or strip the mounting threads.
If it works: The overflow plate is secure, centered, and snug against the tub.
If it doesn’t: If the plate rocks, sits crooked, or will not tighten evenly, back the screws out and reseat the gasket and plate.
Stop if:- The screws spin without tightening, the mounting threads are stripped, or the plate cannot be secured safely.
Step 6: Test the repair under real use
- Dry the area around the overflow plate and any accessible area behind or below the tub again.
- Fill the tub until water enters the overflow, then let it run into the overflow for several minutes.
- Watch for drips around the plate, behind the wall access, or on the ceiling below if that area was leaking before.
- Drain the tub and check once more after the water stops moving to make sure the repair held.
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: If it still leaks, remove the plate and check for a twisted gasket, wrong gasket profile, loose mounting, or damage deeper in the overflow assembly.
Stop if:- Water is still leaking into the wall or below the tub after reseating the gasket and confirming the parts fit. That usually means the overflow elbow or connected piping needs further repair.
Replacement Parts
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FAQ
Do I need to replace the plate and the gasket together?
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.
Why does the tub only leak when it is very full?
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.
Can I reuse the old gasket if it looks okay?
It is better to replace it. Old gaskets flatten, harden, or crack over time, and they often stop sealing well once disturbed.
Should I use caulk around the overflow plate?
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.
What if my bathtub has a trip lever?
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.