Bathtub-Drain10 min read

How to Replace a Bathtub Drain Flange: A Step-by-Step Guide

E
Editorial Team
2026-01-08
How to Replace a Bathtub Drain Flange: A Step-by-Step Guide

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How to Replace a Bathtub Drain Flange: A Step-by-Step Guide

Replacing a bathtub drain flange might seem like a daunting task, but with the right tools and a little patience, you can easily tackle this project yourself. This step-by-step guide will walk you through the entire process, from removing the old flange to installing the new one, ensuring a watertight seal and preventing those annoying slow drains. So, grab your toolbox, and let's get started!

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Before you begin, it's crucial to have everything you need on hand. This will save you time and frustration. Here's a list of what you'll need to replace a bathtub drain flange:

  • New bathtub drain flange: Choose a replacement that matches your tub's existing drain. Consider the finish (chrome, brushed nickel, etc.) for aesthetic consistency.
  • Flathead screwdriver: For prying up the old drain flange.
  • Drain wrench (also known as a dumbbell wrench or a bathtub drain removal tool): Essential for loosening and removing the drain.
  • Pliers (optional): Can be helpful for gripping and turning stubborn parts.
  • Putty knife or scraper: To clean away old plumber's putty or sealant.
  • Plumber's putty: To create a watertight seal around the new drain flange.
  • Clean rags: For wiping up spills and cleaning surfaces.
  • Penetrating oil (optional): If the drain is stuck, penetrating oil can help loosen it.
  • Gloves: To protect your hands.
  • Safety glasses: To protect your eyes.

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Ensure the bathtub is completely empty. Clean around the existing bathtub drain flange with a rag to remove any loose debris or soap scum. This will give you a better grip and a clearer view of the drain.

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This is the trickiest part, but with the right technique, it's manageable.

Step 3.1: Loosen the Drain (If Possible)

Try to loosen the old bathtub drain flange by turning it counterclockwise. You might be able to use your hands, but more likely, you'll need a drain wrench. Insert the drain wrench into the drain opening and position the prongs to grip the drain's crossbars inside. Turn the wrench counterclockwise to loosen the drain.

If it's stuck, don't force it! Apply penetrating oil around the edge of the drain where it meets the tub. Let it sit for about 15-20 minutes to work its way in and loosen any corrosion or buildup.

Step 3.2: Remove the Stopper

Before you can fully remove the drain flange, you'll need to remove the stopper mechanism. There are a few different types:

  • Lift-and-turn stopper: These usually have a small screw on the top of the stopper. Unscrew it and lift the stopper out.
  • Pop-up stopper: These are often connected to a linkage under the tub. You'll need to access the linkage from the overflow plate (usually located near the top of the tub). Remove the overflow plate screws and carefully pull out the linkage and stopper.
  • Toe-touch stopper: Similar to pop-up stoppers, they require access from the overflow plate. Remove the plate and linkage to free the stopper.

Step 3.3: Remove the Drain Flange

Once the stopper is removed, continue turning the drain wrench counterclockwise until the bathtub drain flange is completely detached. If the drain is exceptionally stubborn, you might need to use pliers to grip the wrench for added leverage. Be careful not to damage the tub's finish.

If you don't have a drain wrench, you can try using a flathead screwdriver and hammer to gently tap the flange counterclockwise. Be very careful not to damage the tub. Place the screwdriver at an angle on one of the spokes in the drain and gently tap with the hammer. Move the screwdriver around the drain tapping each spoke until the drain loosens and you can unscrew it by hand.

Step 3.4: Clean the Drain Opening

After removing the old drain, use a putty knife or scraper to thoroughly clean the drain opening. Remove all traces of old plumber's putty, sealant, or any other debris. A clean surface is essential for a good seal.

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Now that the old drain is out and the area is clean, you're ready to install the new bathtub drain flange.

Step 4.1: Apply Plumber's Putty

Roll a rope of plumber's putty about 1/2 inch thick and long enough to encircle the underside of the new drain flange's lip. Press the putty firmly onto the underside of the flange, ensuring there are no gaps.

Step 4.2: Insert the New Drain Flange

Carefully insert the new bathtub drain flange into the drain opening from above. Center it and press it down firmly to seat the putty against the tub surface.

Step 4.3: Tighten the Drain

From underneath the tub (you might need an assistant for this step), attach the drain shoe to the underside of the tub. The drain shoe is the part that connects the drain flange to the drain pipe. Hold the drain flange in place from above while tightening the drain shoe from below.

Use the drain wrench to tighten the bathtub drain flange from above. Turn it clockwise until it is snug but not excessively tight. You should see the plumber's putty squeezing out around the edges of the flange.

Step 4.4: Remove Excess Putty

Use your finger or a putty knife to carefully remove any excess plumber's putty that has squeezed out around the edges of the drain flange. A clean, smooth bead of putty will ensure a watertight seal.

Step 4.5: Reinstall the Stopper

Reinstall the stopper mechanism according to the type of stopper you have (lift-and-turn, pop-up, or toe-touch). Make sure it operates smoothly and seals the drain properly.

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This is a crucial step to ensure your new drain is watertight.

Step 5.1: Plug the Drain

Close the stopper and fill the bathtub with a few inches of water.

Step 5.2: Check for Leaks

Carefully inspect around the drain flange and underneath the tub for any signs of leaks. If you see any water, tighten the drain flange slightly and re-check. If the leak persists, you may need to remove the drain, reapply plumber's putty, and reinstall it.

Step 5.3: Full Tub Test

If there are no leaks with a few inches of water, fill the tub completely and check again. A larger volume of water will put more pressure on the seal and reveal any hidden leaks.

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Using the right tools can make this job significantly easier and prevent damage to your bathtub.

  • Drain wrench (Dumbbell Wrench): This tool is specifically designed for removing and installing bathtub drains. Its dumbbell shape provides leverage and a secure grip on the drain's crossbars. A standard wrench can damage the drain and doesn't provide the necessary torque. The Oatey 39220 Drain Wrench is a popular and reliable choice, known for its durability and ease of use. Its key features include:

    • Durable construction: Made from hardened steel for long-lasting performance.
    • Universal fit: Works with most standard bathtub drains.
    • Ergonomic handle: Provides a comfortable grip and increased leverage.
  • Plumber's Putty: Plumber's putty creates a waterproof seal between the drain flange and the bathtub. Choosing a high-quality putty is essential to prevent leaks and ensure a long-lasting repair. The Harvey 030500 Plumbers Putty is a widely trusted option. Its key features include:

    • Non-hardening formula: Remains pliable for an extended period, allowing for adjustments during installation.
    • Waterproof: Creates a tight seal to prevent leaks and water damage.
    • Easy to apply: Soft and pliable, making it easy to mold and shape.

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  • What if the drain is extremely stuck? If penetrating oil doesn't work, try using a heat gun to gently warm the drain flange. The heat can help soften any corrosion or buildup. Be careful not to overheat the drain or the tub's finish.
  • Can I use silicone caulk instead of plumber's putty? While silicone caulk can be used, plumber's putty is generally preferred for drain installations. Putty remains pliable and allows for easier removal and adjustments in the future. Silicone can be difficult to remove if you need to replace the drain again.
  • How do I prevent the new drain flange from corroding? Regularly clean around the drain with a mild soap and water solution to remove soap scum and mineral deposits. Avoid using harsh chemicals or abrasive cleaners, as they can damage the finish of the flange.
  • What if the overflow pipe is leaking? If you notice a leak from the overflow pipe (the pipe with the lever to control the drain stopper), you may need to replace the overflow plate gasket. Turn off the water supply, remove the overflow plate, and replace the old gasket with a new one.
  • How often should I replace my bathtub drain flange? The lifespan of a bathtub drain flange depends on several factors, including water quality, usage frequency, and the quality of the original installation. However, it's generally a good idea to inspect your drain flange every few years. Look for signs of corrosion, leaks, or damage. If you notice any of these issues, it's best to replace the drain flange as soon as possible to prevent further damage.
  • Why is my bathtub draining slowly even after replacing the flange? A slow drain after replacing the flange usually indicates a clog further down the drain line. Try using a drain snake or a chemical drain cleaner to clear the clog. If the problem persists, you may need to call a plumber to inspect the drainpipe for more serious issues.
  • Can I hire a plumber to do this? Absolutely! If you're not comfortable doing this project yourself, hiring a plumber is always a good option. A plumber has the experience and tools to quickly and efficiently replace your bathtub drain flange. They can also identify and fix any other plumbing issues that may be present.

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Replacing a bathtub drain flange is a manageable DIY project that can save you money and prevent water damage. By following these step-by-step instructions and taking your time, you can successfully replace your old drain with a new one, ensuring a watertight seal and a smoothly draining bathtub. Don't be intimidated - you've got this! Enjoy your newly refreshed bathtub experience. Remember to test for leaks thoroughly and address any issues promptly to avoid potential problems down the road. With a little effort, you can keep your bathroom in top shape and enjoy a relaxing soak in your tub for years to come. <br><a href="https://www.amazon.com/s?k=bathtub drain flange&sort=price-asc-rank&tag=bestbathroomrenovation-20">[Shop Budget-Friendly bathtub drain flange on Amazon.]</a><br>

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