How to Replace a Bathtub Drain Flange

Begin by thoroughly cleaning the bathtub, especially around the drain area, to remove any soap scum and residue. Lay down an old towel or thick cloth in the bottom of the tub to protect its surface from accidental scratches by tools. Gather all the tools and materials you will need for the job and place them within easy reach.

To remove a Push-and-Lock (or Toe-Touch) stopper, first ensure it is in the open position. Grip the top cap of the stopper and unscrew it counter-clockwise. Some may be tight and require pliers with a cloth to protect the finish. Once the cap is off, it will reveal a central screw post. Use a Phillips or flathead screwdriver to unscrew this central component, which will release the entire stopper mechanism from the drain flange's crossbars.

This is often the most challenging step. Insert a specialized drain wrench, such as a Smart Dumbbell or drain key, into the drain opening so it firmly engages with the crossbars of the flange. Attach an adjustable wrench or large pliers to the top of the drain wrench. Apply firm, steady pressure counter-clockwise to unscrew the flange. If it's stuck, do not force it. Instead, apply penetrating oil around the edge and let it sit for 15-20 minutes. You can also use a hairdryer to gently warm the flange, which can help break the seal of old plumber's putty. Once loosened, continue to unscrew the flange until it is completely free from the drain shoe below.

With the old flange removed, use a plastic putty knife to carefully scrape away all the old, hardened plumber's putty from the surface of the tub around the drain opening. Be careful not to scratch the tub's finish. Use a rag dampened with mineral spirits or rubbing alcohol to wipe the area clean, removing any remaining residue. Also, use the rag to clean the threads inside the drain shoe below the tub, ensuring a clean connection for the new flange.

Take a generous amount of plumber's putty from its container. Knead and warm it in your hands for a minute to make it soft and pliable. Roll the putty between your palms to form a uniform rope that is slightly thicker than a pencil (about 1/4 to 3/8 inch in diameter). Carefully press this rope of putty onto the underside of the new drain flange's lip, ensuring it forms a complete, unbroken circle.

Carefully lower the new flange, with putty applied, into the drain opening. Gently turn it clockwise by hand to engage the threads with the drain shoe below. Be very careful not to cross-thread it; if you feel resistance, back it out and try again. Once it is hand-tight, insert the drain wrench. Use your adjustable wrench or pliers to give it another quarter to a half turn until it is snug. You should see a uniform ring of excess plumber's putty squeeze out around the entire perimeter of the flange. This indicates a good seal.

Use your finger or a plastic putty knife to wipe away the ring of excess plumber's putty that squeezed out from under the flange. Use a clean rag to polish the area. Now, reinstall the drain stopper. Screw the central post back into the flange's crossbars until snug, but do not overtighten. Finally, screw the stopper cap back onto the post until it is hand-tight.

To ensure your work is successful, perform a thorough leak test. Close the new drain stopper and fill the tub with several inches of water. Let the water sit for at least 15-20 minutes. If you have an access panel or can see the drain from below, use a flashlight to inspect the underside of the drain assembly for any drips. If there is no access, look for any water seeping out around the flange inside the tub. After checking for static leaks, open the drain and let the water flow out. Observe the drain closely as it empties to ensure no water is leaking from under the flange's edge.