How to Remove a Broken Bathtub Drain With Snapped Crossbars

The crossbars inside a tub drain are thin brass or zinc, and after decades of corrosion they snap the moment you put a drain key on them. Once they are gone, the usual tool has nothing to grab. Knowing how to remove a broken bathtub drain means switching to tools that grip the inside wall of the drain body instead, softening the threads with heat and penetrating oil, and, as a last resort, cutting relief slots so the flange collapses inward.

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A tub drain (also called the drain flange or strainer body) threads into a fitting called the drain shoe underneath the tub. Unscrewing it counterclockwise is all that holds it in. With the crossbars broken, you need to apply that same twist from a different grip point. Most homeowners can get it out in an hour with an internal drain extractor and some patience.

The approach assumes the drain is the only problem. If the shoe underneath spins, cracks, or the tub itself is damaged, stop and get help before turning a small repair into a bigger one.

How to Remove a Broken Bathtub Drain: Assess the Damage First

Look closely at what is left. Shine a flashlight down the drain and note:

• Partial crossbars: one bar remaining or stubs on both sides.
• No crossbars: the drain is now just a smooth or threaded ring.
• Corroded or pitted flange: the visible lip around the drain is eaten away or flaking.
• Old putty or caulk: a heavy bead around the flange that may be acting like glue.

Also check what type of stopper was in it. Toe-touch, lift-and-turn and push-pull stoppers screw into the crossbars or a center post. Trip-lever stoppers work through the overflow and do not touch the drain body. Remove any remaining stopper parts first.

If you can reach the tub’s underside through an access panel, look at the drain shoe. If the shoe is cracked, heavily corroded, or the joint is leaking, plan for a plumber. Twisting a weak shoe can break it, and replacing it often requires access below the tub.

Tools and Materials

• Internal drain extractor (a tapered, ridged tool that bites into the drain wall)
• Large adjustable wrench or a ratchet with a socket to fit the extractor
• Penetrating oil
• Hair dryer or heat gun on low setting
• Needle-nose pliers and a flathead screwdriver
• Oscillating multi-tool or hacksaw blade with a handle, for relief cuts
• Painter’s tape and a sheet of thin cardboard to protect the tub finish
• Safety glasses and work gloves
• Plastic scraper and rags
• New tub drain flange, plumber’s putty or silicone

An internal drain extractor is the best single tool for this job. Some versions are a solid tapered plug with sharp spiral flutes. Others are expanding types that tighten outward against the drain wall. Both let you turn the drain from the inside without relying on crossbars.

Step 1: Clean and Prepare

Clear hair and debris out of the drain. Scrape away old caulk or putty around the flange with a plastic scraper so nothing binds it to the tub. Wipe the area dry.

Apply painter’s tape around the drain on the tub surface. Enamel, acrylic and fiberglass tubs all scratch easily, and a slipping tool can chip porcelain on cast iron or steel tubs. A layer of tape plus a thin piece of cardboard with a hole cut for the drain gives good protection.

Step 2: Loosen With Penetrating Oil and Heat

Spray penetrating oil around the edge of the flange and down inside the drain where the threads meet. Let it sit 15 to 30 minutes. Corrosion and old putty often set the threads like cement, and penetrating oil needs time to wick in.

Gentle heat helps. Warm the drain flange with a hair dryer for several minutes. Brass expands slightly with heat, which can crack the corrosion bond. If you use a heat gun, keep it on low, keep it moving, and never aim it at an acrylic or fiberglass tub surface for long, since those can scorch or warp. Do not use a torch inside the tub.

Step 3: Use an Internal Drain Extractor

Insert the extractor into the drain. For a tapered type, push it in and tap it lightly with a rubber mallet so the flutes bite into the inner wall. For an expanding type, tighten its center bolt until it grips firmly.

Attach a wrench or ratchet and turn counterclockwise with steady, even pressure. Avoid sudden jerks, which can break the drain loose from the shoe in a twisting motion that stresses the joint below. If you have a helper and access below, have them hold the shoe still with a wrench.

The first quarter turn is the hardest. Once it breaks free, the drain usually spins out easily. If the extractor slips, reset it deeper and try again. Repeat oil and heat between attempts if needed.

Step 4: Try Other Grip Methods if the Extractor Won’t Work

If no extractor is available, a few improvised methods sometimes work on a drain with partial crossbars:

• Pliers on remaining bars: grab stubs with needle-nose pliers and use a screwdriver through the handles for leverage. This works only if the stubs are solid.
• Screwdriver wedged against the threads: some people wedge a stout flathead into the drain wall and twist. It can work but risks slipping.
• Drain key with expanding ends: some drain keys have serrated expanding jaws for crossbar-less drains.

Don’t try to hammer a screwdriver into the drain or pry against the tub. That’s how tubs get chipped or cracked.

Step 5: Cut Relief Slots as a Last Resort

When the drain refuses to turn, you can cut it out. Using an oscillating tool with a metal-cutting blade, or a hacksaw blade held in a handle, cut two vertical slots through the drain wall, opposite each other. Cut only through the drain flange metal and stop before you reach the threads of the shoe below. Go slowly and cut from the inside so the blade never touches the tub surface.

Once slotted, use a flathead screwdriver or pliers to fold one section inward. Collapsing the ring relieves the pressure on the threads, and the pieces can then be twisted out or pulled free. Wear safety glasses, because small metal shards fly.

If you cut too deep and damage the shoe threads, the shoe must be replaced, which usually requires access to the drain from below.

Step 6: Clean Up and Install the New Drain

Scrape remaining putty off the tub and clean the shoe threads. Check that they are intact. Roll a rope of plumber’s putty around the underside of the new flange, or use silicone if your tub maker prefers it, and thread the new drain into the shoe by hand. Tighten with a drain key until snug and the putty squeezes out evenly. Wipe away excess.

Run water and check below the tub, if accessible, for leaks. Fill the tub several inches and drain it to test the seal under load.

Troubleshooting

Knowing how to remove a broken bathtub drain also means recognizing when the problem is bigger than the drain flange.

The whole drain shoe spins. Stop immediately. The shoe connection below is loose or broken. You will need access from below to hold it or replace it, which is usually a plumber’s job.

The extractor keeps slipping. The drain wall may be thin or polished. Try a size larger, add more oil, and tap it in more firmly, or switch to relief cuts.

The flange came out but the threads are stripped. Replace the shoe. A new flange won’t seal on damaged threads.

Leak below the tub after reinstalling. The shoe gasket under the tub may be failed. Check through an access panel or the ceiling below.

Water stains on the ceiling below. A leaking shoe gasket may have been dripping for a long time. Check for mold and soft drywall. Have a pro assess any area larger than about 10 square feet.

Cost Ranges

Internal drain extractors are inexpensive, often costing about the same as a pizza. A replacement tub drain flange ranges from basic chrome to designer finishes. If you hire a plumber for a stuck drain, expect a service call plus labor, often a few hundred dollars. Replacing a drain shoe or full waste-and-overflow assembly typically costs more because it often requires access from below, which may mean cutting into a ceiling or wall.

When to Call a Plumber

Call a licensed plumber when the drain shoe spins, cracks or leaks; when the tub has no access below and the full drain assembly needs replacement; or when you see water damage on the ceiling underneath. A plumber can also handle cast iron tubs, where heavy corrosion and brittle old drains make removal more difficult. Opening a ceiling or wall to reach drain parts carries its own risks, including hidden wiring and pipes, and in older homes, materials that may contain asbestos or lead.