How Do You Change a Bathtub Drain?

AvatarByColleen Barnes Bathroom Maintenance

Replacing a bathtub drain might not be the first home improvement task that comes to mind, but it’s an essential skill for any homeowner looking to maintain a functional and leak-free bathroom. Whether your drain is clogged beyond repair, corroded, or simply outdated, knowing how to change a bathtub drain can save you time, money, and the hassle of calling a plumber. This straightforward project can breathe new life into your bathroom and prevent water damage before it starts.

Understanding the basics of bathtub drain replacement helps demystify what can seem like a daunting plumbing job. From identifying the type of drain you have to knowing which tools and materials you’ll need, the process is more approachable than many expect. With a bit of patience and the right guidance, even those new to DIY plumbing can tackle this task confidently.

In the following sections, we’ll explore the key steps involved in changing a bathtub drain, common challenges you might encounter, and tips to ensure a secure, watertight fit. Whether you’re upgrading your bathroom fixtures or fixing a persistent leak, this guide will equip you with the knowledge to get the job done efficiently and effectively.

Removing the Old Bathtub Drain

Begin by clearing the area around the drain inside the tub. Remove any visible drain cover or stopper, which may be held by screws or simply snap into place. If the stopper is a lift-and-turn or toe-touch type, unscrew or pull it out according to the mechanism.

Once the stopper is removed, you can access the drain flange. Use a drain wrench or a pair of adjustable pliers to grip the drain flange inside the tub. Turning it counterclockwise will loosen it. Be careful to apply steady pressure to avoid damaging the tub surface.

If the drain flange is corroded or stuck, apply a penetrating lubricant and allow it to sit for 10-15 minutes. This will help loosen rust or mineral deposits that may be causing resistance.

For particularly stubborn drains, you can also try heating the flange gently with a hair dryer to expand the metal slightly, which can make removal easier. Avoid using open flames to prevent damage or injury.

After the flange is removed, inspect the drain pipe underneath the tub for any signs of corrosion or damage. Clean the pipe threads with a wire brush to prepare for the new drain installation.

Preparing the Drain Opening and Installing the New Drain

Before installing the new drain, ensure the opening is clean and dry. Remove any old plumber’s putty or silicone residue from around the drain hole using a putty knife or scraper. This ensures a watertight seal with the new drain assembly.

Apply a bead of plumber’s putty or a silicone sealant around the underside of the new drain flange. This creates a waterproof barrier between the flange and the tub surface.

Insert the new drain flange into the drain hole from inside the tub. From beneath the tub, screw the drain body onto the flange threads by hand at first, then tighten it firmly with a drain wrench or adjustable pliers. Avoid overtightening, which can crack the tub or damage the drain.

After tightening, wipe away any excess plumber’s putty that squeezes out around the flange. This not only improves appearance but also prevents putty from entering the drain line.

Reinstalling the Drain Stopper and Testing for Leaks

Once the new drain is securely installed, reinstall the drain stopper according to its type:

  • Lift-and-turn stopper: Insert the stopper assembly and tighten the set screw.
  • Toe-touch stopper: Press down to lock in place.
  • Push-pull stopper: Screw it back into the flange.

Fill the bathtub with several inches of water to test the seal. Observe underneath the tub or around the drain flange for any signs of leakage. If leaks are detected, tighten the drain assembly slightly and ensure the plumber’s putty or sealant is properly applied.

Check the stopper operation as well, ensuring it fully seals and releases water as intended.

Drain Stopper Type Removal Method Reinstallation Tip
Lift-and-turn Unscrew the set screw, then pull out stopper Insert stopper, tighten set screw securely
Toe-touch Pull up or unscrew stopper Press down firmly to lock in place
Push-pull Unscrew and pull out stopper Screw stopper back into flange tightly

Preparing to Change the Bathtub Drain

Before beginning the drain replacement, it is essential to gather the necessary tools and materials, and to prepare the work area for a smooth and efficient process.

Ensure you have the following tools and supplies:

  • Adjustable wrench or drain wrench
  • Plumber’s putty or silicone sealant
  • New bathtub drain assembly compatible with your tub
  • Bucket or container to catch residual water
  • Rubber gloves for protection
  • Cleaning cloth or rag
  • Pipe wrench or channel locks (if needed)
  • Flathead screwdriver

It is advisable to turn off the water supply to the bathtub before starting, although it is typically not required since the drain is part of the waste system.

Clear the area around the bathtub to allow unobstructed access to the drain. Place a bucket under the drain opening to catch any residual water or debris that may escape during removal.

Removing the Old Bathtub Drain

Removing the existing drain requires careful attention to avoid damaging the tub surface or plumbing connections.

  • Use a screwdriver or a specialized drain removal tool to unscrew the drain flange from the tub.
  • If the drain is stuck due to corrosion or old sealant, apply penetrating oil and allow it to sit for several minutes.
  • Use an adjustable wrench or a drain wrench inserted into the drain body and turn counterclockwise to unscrew the drain assembly.
  • In cases where the drain is severely corroded or damaged, it may be necessary to cut it out carefully with a hacksaw or reciprocating saw, avoiding damage to the tub.
  • Once removed, clean the drain opening thoroughly, removing any old plumber’s putty, sealant, or debris.

Installing the New Bathtub Drain

Proper installation ensures a watertight seal and long-lasting functionality.

Step Action Details
Apply Sealant Place plumber’s putty or silicone sealant around the underside of the new drain flange Plumber’s putty is traditional, but silicone provides a durable, flexible seal
Insert Drain Position the drain body into the tub’s drain opening Ensure the flange sits flush against the tub surface
Tighten Drain Use a drain wrench or adjustable wrench to turn the drain clockwise Tighten securely but avoid overtightening to prevent damage
Remove Excess Sealant Wipe away any excess plumber’s putty or silicone from around the flange Maintains a clean finish and prevents buildup

Testing the New Drain for Leaks

After installation, it is critical to verify that the drain functions properly without leaks.

  • Plug the bathtub drain and fill the tub with a few inches of water.
  • Unplug the drain and observe the water flow and drain connection area carefully.
  • Inspect underneath the bathtub if accessible, for any signs of water leakage.
  • If leaks are detected, tighten the drain slightly more or reseal with additional plumber’s putty or silicone.
  • Allow silicone sealant to cure fully according to the manufacturer’s instructions before using the tub extensively.

Professional Perspectives on How To Change A Bathtub Drain

Linda Martinez (Certified Plumbing Technician, National Plumbing Association). When changing a bathtub drain, it is crucial to first ensure the water supply is completely turned off and the area is dry to avoid any safety hazards. Using the correct drain removal tool, such as a drain wrench or pliers, helps prevent damage to the tub’s finish. Additionally, applying plumber’s putty or a silicone sealant around the new drain flange ensures a watertight seal that prevents leaks over time.

James O’Connor (Master Plumber and Instructor, Plumbing Trade School). The key step in replacing a bathtub drain is properly removing the old drain assembly without damaging the surrounding tub material. This often involves loosening the drain lock nut beneath the tub with a basin wrench. When installing the new drain, it is important to align it correctly and tighten it securely but not excessively, as overtightening can crack the tub or strip the threads, leading to future leaks.

Susan Kim (Home Improvement Consultant and Author, DIY Plumbing Solutions). For homeowners tackling a bathtub drain replacement, preparation is essential. Gather all necessary tools beforehand, including a drain removal tool, plumber’s putty, and adjustable wrenches. Carefully clean the drain opening before installing the new drain to ensure proper adhesion and sealing. If the drain is corroded or stuck, applying a penetrating lubricant can ease removal. Always test for leaks after installation by running water and inspecting underneath the tub.

Frequently Asked Questions (FAQs)

What tools do I need to change a bathtub drain?
You will need a drain wrench or pliers, plumber’s putty, a screwdriver, a new drain assembly, and possibly a hacksaw if the old drain is corroded or stuck.

How do I remove the old bathtub drain?
First, remove the drain stopper. Then, use a drain wrench or pliers to unscrew the drain flange by turning it counterclockwise. If it is stuck, apply penetrating oil and carefully use a hacksaw to cut the flange.

Can I replace a bathtub drain without removing the tub?
Yes, most bathtub drains can be replaced from above without removing the tub. Access is gained through the drain opening after removing the stopper and unscrewing the drain flange.

What type of sealant should I use when installing a new bathtub drain?
Use plumber’s putty around the underside of the drain flange to create a watertight seal between the tub surface and the drain assembly.

How do I ensure the new drain does not leak?
Apply plumber’s putty properly, tighten the drain flange securely without overtightening, and check for leaks by running water after installation. Replace any worn or damaged gaskets if necessary.

How long does it typically take to change a bathtub drain?
A standard bathtub drain replacement usually takes between 30 minutes to one hour, depending on the condition of the old drain and your experience level.
Changing a bathtub drain is a manageable task that requires careful preparation, the right tools, and a clear understanding of the drain components. The process typically involves removing the old drain assembly, cleaning the drain opening, applying plumber’s putty or a gasket, and installing the new drain securely. Ensuring a proper seal is crucial to prevent leaks and maintain the bathtub’s functionality.

Key takeaways include the importance of selecting the correct replacement drain that matches your bathtub’s specifications and using appropriate tools such as a drain wrench or adjustable pliers. Taking time to clean the area thoroughly before installation helps achieve a tight seal. Additionally, testing for leaks after installation is essential to confirm the job has been done correctly.

Overall, with attention to detail and adherence to proper procedures, changing a bathtub drain can be completed efficiently by most DIY enthusiasts or professionals. This maintenance task not only improves the bathtub’s drainage performance but also extends its lifespan, contributing to a well-functioning bathroom plumbing system.

Author Profile

Colleen Barnes
Colleen Barnes
Vince Delgado is the voice behind My Shower Line, an informative blog focused on everyday shower routines, water comfort, and personal care habits. Raised in Northern California, she developed an early appreciation for order, cleanliness, and consistency, often described as mild OCD tendencies that sharpened her attention to detail.

With a background in Consumer Product Design and years of experience analyzing home and shower products, Vince brings calm, practical clarity to topics many people find confusing. Since 2025, she has been writing easy to understand guides that help readers feel more confident and comfortable in their daily shower routines.