Step-by-step fix
Step 1: Set up the tub and work area
- Remove the tub stopper or drain cover so the flange is fully exposed.
- Lay a towel or soft cloth in the tub to protect the finish and catch dropped tools.
- Wipe the drain area clean so you can see the flange, crossbars, and old sealant clearly.
- If your tub has an access panel to the drain plumbing, open it so you can watch for movement or leaks below while you work.
If it works: The drain flange is exposed, the tub surface is protected, and you have a clear view of the work area.
If it doesn’t: If the stopper assembly will not come out, check for a visible set screw or threaded connection and remove only what is needed to expose the flange.
Stop if:- The drain body below the tub is already loose or leaking before you begin.
- The flange area is badly cracked, rusted through, or missing support below the tub.
Step 2: Remove the old drain flange
- Insert the tub drain wrench into the flange so it grips the inside securely.
- Turn the flange counterclockwise to loosen it. Use pliers on the wrench only if you need extra leverage.
- Work slowly and keep the tool centered to avoid slipping and scratching the tub.
- Lift the old flange out once the threads release.
If it works: The old drain flange comes out without twisting the drain shoe below the tub.
If it doesn’t: If the flange is stuck, apply steady pressure rather than sudden force. Clean visible buildup from the inside edge and try again. If the drain body below starts moving, stop and reassess from the access side if available.
Stop if:- The crossbars break off and the flange cannot be removed cleanly.
- The drain shoe below the tub turns with the flange.
- You need excessive force that could crack the tub or damage hidden plumbing.
Step 3: Clean the drain opening and inspect the threads
- Peel or scrape away all old plumber's putty, gasket material, tape, or sealant from the tub surface and flange threads.
- Wipe the area until the sealing surface around the drain opening is smooth and clean.
- Inspect the drain shoe threads for damage, corrosion, or cracks.
- Dry the area so the new seal can seat properly.
If it works: The drain opening is clean, smooth, and ready for the new flange.
If it doesn’t: If residue remains, keep scraping gently with a plastic tool and wipe again. A clean sealing surface matters more than speed.
Stop if:- The drain shoe threads are stripped or badly corroded.
- You find cracks in the tub around the drain opening.
- The drain shoe is loose and cannot be held steady.
Step 4: Prepare and install the new flange
- Confirm the new bathtub drain flange matches the old one in diameter, thread style, and overall shape.
- Roll a thin, even bead of plumber's putty under the flange lip, or use tub-safe sealant if your replacement instructions call for it.
- Thread the new flange into the drain opening by hand first to avoid cross-threading.
- Tighten it with the drain wrench until it is snug and evenly seated. Do not overtighten.
- Wipe away excess putty or sealant squeezed out around the flange.
If it works: The new flange sits flat against the tub and threads in smoothly without wobble.
If it doesn’t: If the flange binds or tilts, back it out and start again by hand. If it still will not thread correctly, recheck the fit before forcing it.
Stop if:- The flange cross-threads or will not seat evenly.
- The drain shoe below the tub rotates while tightening.
- The tub surface begins to flex or crack around the drain opening.
Step 5: Reinstall the stopper and let the seal settle
- Reinstall the stopper or drain hardware you removed earlier.
- If you used sealant instead of putty, allow the recommended cure time before filling the tub.
- Wipe the area clean so any new moisture during testing will be easy to spot.
- If you have access below the tub, position a flashlight there for the leak check.
If it works: The drain assembly is back together and ready for testing.
If it doesn’t: If the stopper does not fit or operate correctly, remove it and confirm the flange opening and stopper style are compatible.
Stop if:- The stopper threads or linkage do not match the new flange.
- You cannot reassemble the drain parts without forcing them.
Step 6: Test for leaks and proper draining
- Close the stopper and add a few inches of water to the tub.
- Check around the flange at the tub surface for seepage.
- Release the water and watch the drain as it empties. If you have access below, inspect the drain shoe and nearby connections for drips.
- Run a second test with a little more water to confirm the seal holds during both standing water and draining.
If it works: The tub holds water, drains normally, and shows no leaks at the flange or below the tub.
If it doesn’t: If you see minor seepage at the top, the flange may need to be removed and resealed. If leaking appears below the tub, the issue may involve the drain shoe or connecting plumbing.
Stop if:- Water leaks below the tub during the test.
- The flange loosens while draining.
- The tub drains poorly even though the flange is installed correctly, suggesting a separate clog or drain problem.
Replacement Parts
Repair Riot may earn a commission from qualifying purchases, at no extra cost to you.
FAQ
Do I need plumber's putty for a bathtub drain flange?
Many bathtub drain flanges are sealed with plumber's putty under the flange lip, but some replacements may call for a tub-safe sealant instead. Follow the replacement part guidance if provided, and do not use a product that could damage the tub finish.
What if the old drain flange will not unscrew?
Try a proper tub drain wrench and steady pressure first. If the drain shoe below the tub starts turning, stop before you damage hidden plumbing. A badly seized or broken flange may need a more advanced removal method or professional help.
Can I replace just the flange and not the whole drain assembly?
Yes, if the drain shoe threads are in good condition and there are no leaks below the tub. If the shoe is cracked, loose, or corroded, replacing only the flange may not solve the problem.
Why is my new flange leaking after installation?
The most common causes are leftover old putty, uneven seating, cross-threading, or not enough fresh sealant under the flange lip. Remove it, clean the area fully, and reinstall it carefully. If the leak is below the tub, the problem may be deeper in the drain assembly.
How tight should a bathtub drain flange be?
It should be snug and evenly seated, not forced. Overtightening can damage the tub surface, distort the seal, or twist the drain shoe below the tub.