After successfully removing the old flange, it is crucial to prepare the surface for the new installation. Use a plastic putty knife to scrape away the bulk of the old, hardened plumber's putty from the bathtub surface around the drain opening. Use a wire brush to thoroughly clean the female threads inside the drain pipe (the drain shoe), removing any bits of old putty, sealant, or corrosion. Be meticulous with this step to ensure the new flange will seal properly. Finally, wipe the entire area—both the tub surface and the pipe threads—with a clean rag. For a perfectly clean surface, you can wipe it down with a rag dampened with mineral spirits or rubbing alcohol to remove any final oily residue.
You're viewing a step from: How to Remove a Stuck Bathtub Drain Flange
This guide provides comprehensive, step-by-step instructions for removing a bathtub drain flange that is stuck due to age, corrosion, or hardened plumber's putty. The process begins with preparation and initial attempts using standard tools, then escalates to more advanced techniques involving penetrating oils, specialized drain wrenches, and, as a last resort, cutting the flange.
Frequently Asked Questions
What should I do if the drain key or wrench just slips, or the flange doesn't budge after applying penetrating oil?
If initial attempts fail, the flange is likely severely corroded or the putty is rock-hard. Apply more penetrating oil, like KROIL, and let it sit for several hours or even overnight to allow it to fully penetrate. If it still won't turn, your last resort is to carefully cut the flange using a rotary tool with a metal cutting wheel, making two opposing cuts without damaging the drain pipe threads.
Is it safe to cut the drain flange, and what precautions should I take?
Cutting the flange is a last resort and requires careful attention to safety. Always wear safety glasses and gloves to protect against metal fragments and sparks. Use a rotary tool with a metal cutting wheel, making two shallow, opposing cuts from the inside of the flange, being extremely careful not to cut into the drain shoe's threads below the flange.
How can I minimize the risk of damaging the bathtub or drain pipe during removal?
To prevent damage, protect the tub surface with a rag or towel if using a wrench or other tools that might slip. When cutting the flange, make shallow passes and continuously confirm you are only cutting the flange metal. Avoid excessive force, as that can warp the drain shoe or break connections further down the pipe.
Given this is a 'beginner' project, what are the most essential tools I absolutely need to have on hand?
Beyond basic safety gear, you'll definitely need a high-quality penetrating oil like KROIL, an adjustable wrench, and a specialized drain key or removal tool. For very stuck flanges, a rotary tool like the WEN 101-Piece Rotary Tool Kit with a metal cutting wheel (Stark 5 in. Metal Cut Saw Wheel) becomes essential. A putty knife and rags are also vital for preparation and cleanup.
How to Remove a Stuck Bathtub Drain Flange
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Step 1: Prepare the Work Area and Remove Stopper
Step 1: Prepare the Work Area and Remove Stopper
Step 1: Prepare the Work Area and Remove Stopper
Step 2: Apply Penetrating Oil
Step 2: Apply Penetrating Oil
Step 2: Apply Penetrating Oil
Step 3: Use a Drain Key for Removal
Step 3: Use a Drain Key for Removal
Step 3: Use a Drain Key for Removal
Step 4: Cut the Flange (Last Resort)
Step 4: Cut the Flange (Last Resort)
Step 4: Cut the Flange (Last Resort)
Step 5: Clean the Drain Threads and Surface
Step 5: Clean the Drain Threads and Surface
Step 5: Clean the Drain Threads and Surface
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