How Do You Replace a Bathtub Drain Step-by-Step?

AvatarByColleen Barnes Bathroom Maintenance

Replacing a bathtub drain might seem like a daunting task, but it’s a manageable DIY project that can save you time and money while improving your bathroom’s functionality. Whether your drain is clogged beyond repair, leaking, or simply outdated, knowing how to replace it properly ensures a smooth, watertight finish that keeps your tub draining efficiently. With the right tools and a bit of patience, you can tackle this common plumbing fix without calling in a professional.

Understanding the basics of bathtub drain replacement is essential before diving in. It involves removing the old drain assembly, preparing the area for the new one, and installing a replacement that fits securely and prevents leaks. While the process may vary slightly depending on the type of drain and bathtub, the core principles remain the same. This knowledge not only empowers you to handle minor repairs but also helps you identify when a professional’s help might be necessary.

In the following sections, you’ll discover what materials and tools you’ll need, the step-by-step approach to removing and installing a bathtub drain, and helpful tips to avoid common pitfalls. With this guidance, you’ll gain the confidence to refresh your bathtub’s drainage system and keep your bathroom running smoothly.

Tools and Materials Needed for Replacing a Bathtub Drain

Before beginning the replacement process, it is essential to gather all necessary tools and materials. Having everything on hand will streamline the procedure and help avoid interruptions.

Common tools and materials include:

  • Drain removal tool or adjustable pliers
  • Screwdriver (flathead or Phillips, depending on drain type)
  • Plumber’s putty or silicone caulk
  • Replacement bathtub drain assembly
  • Pipe wrench or channel locks
  • Bucket or container to catch water
  • Towels or rags for cleanup
  • Utility knife
  • Plumber’s tape (Teflon tape)

The exact replacement drain type may vary depending on your bathtub model and existing plumbing. It is recommended to verify compatibility before purchasing a new drain assembly.

Tool or Material Purpose Tips
Drain Removal Tool To unscrew the old drain without damaging the tub Use a tool specifically designed for drains to avoid scratches
Plumber’s Putty or Silicone Caulk Creates a watertight seal around the new drain Putty is easier to remove; caulk provides a stronger seal
Replacement Drain Assembly New drain to replace the old one Match size and threading to existing drain
Pipe Wrench / Channel Locks Loosening and tightening drain connections under the tub Use padded jaws to prevent damage to pipes

Step-by-Step Process to Remove the Old Bathtub Drain

Start by ensuring the water supply to the bathtub is turned off and the tub is dry. Place a bucket beneath the drain pipe to catch any residual water.

To remove the old drain:

  • Remove the drain stopper, if present, by unscrewing or pulling it out.
  • Use a drain removal tool or adjustable pliers to grip the drain flange inside the tub.
  • Turn the tool counterclockwise to unscrew the drain flange. If it is stuck, apply penetrating oil and allow it to sit for 10-15 minutes.
  • Once loose, continue unscrewing by hand until the drain flange and drain body can be removed.
  • Underneath the tub, disconnect the drain pipe if necessary by loosening slip nuts with a wrench.
  • Clean the drain opening thoroughly to remove old plumber’s putty, caulk, or debris using a putty knife or utility knife.

Proper cleaning ensures a good seal for the new drain and prevents leaks.

Installing the New Bathtub Drain

The installation of the new drain requires careful attention to sealing and alignment:

  • Apply a generous bead of plumber’s putty or silicone caulk around the underside lip of the new drain flange.
  • Insert the drain flange into the drain opening from inside the tub, pressing firmly to create a seal.
  • From beneath the tub, thread the drain body onto the flange. Hand-tighten first, then use the drain removal tool or pliers to secure firmly without overtightening.
  • Reconnect the drain pipe and tighten any slip nuts or connections.
  • Remove any excess putty that squeezes out around the flange with a putty knife or rag.
  • Allow silicone caulk to cure according to manufacturer instructions if used.

Testing the New Drain for Leaks

Once installation is complete, it is critical to test the new drain for proper function and to ensure there are no leaks:

  • Close the drain stopper.
  • Fill the tub with several inches of water.
  • Observe the drain connections underneath the tub for any signs of dripping or moisture.
  • If leaks are detected, tighten connections or reapply putty or caulk as needed.
  • Release the stopper and confirm that water drains smoothly without backing up.

Regular checks during the first few days after replacement will help identify any issues early.

Common Issues and Troubleshooting Tips

Replacing a bathtub drain may present some challenges. The following are common issues and solutions:

  • Stuck or Corroded Drain Flange: Use penetrating oil and allow time to loosen. If necessary, carefully cut through the flange with a rotary tool.
  • Leaking Seal: Ensure the plumber’s putty or silicone is applied evenly. Remove the drain and reapply if leaks persist.
  • Incorrect Drain Size or Threading: Verify measurements before purchase. Use an adapter if needed to match plumbing.
  • Difficulty Accessing Drain from Below: Use a flexible drain wrench or consider removing the tub access panel.

Addressing these issues promptly ensures a durable and leak-free installation.

Tools and Materials Needed for Replacing a Bathtub Drain

Before beginning the replacement process, ensure you have the following tools and materials on hand. Having everything prepared will streamline the work and prevent interruptions.

  • Drain wrench or adjustable pliers: To loosen and tighten the drain flange.
  • Flathead screwdriver: For removing any screws securing the drain assembly.
  • Putty knife: To scrape off old plumber’s putty or sealant.
  • Plumber’s putty or silicone sealant: To seal the new drain flange.
  • Replacement bathtub drain assembly: Ensure the new drain matches the size and type of the old one.
  • Bucket or towels: To catch any residual water during removal.
  • Rubber gloves: For hygiene and better grip.
  • Pipe wrench (optional): Useful if the drainpipe connections are tight.

Step-by-Step Process to Remove the Old Bathtub Drain

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

Follow these steps precisely:

  1. Clear the area: Remove any bath mats or items around the tub. Lay towels to protect the tub surface.
  2. Drain residual water: Place a bucket under the drain access panel (if available) or be prepared for water spillage.
  3. Remove the drain stopper: Depending on the type, unscrew or pull out the stopper to expose the drain flange.
  4. Loosen the drain flange: Use a drain wrench inserted into the crossbars of the flange or adjustable pliers to turn the flange counterclockwise.
  5. Clear old sealant: After removal, use a putty knife to scrape away old plumber’s putty or silicone from the drain opening.

Note: If the flange is severely corroded or stuck, applying penetrating oil and allowing it to sit can facilitate removal.

Installing the New Bathtub Drain

Proper installation ensures a watertight seal and prevents leaks. Follow these guidelines carefully.

Step Action Details and Tips
1 Apply sealant Roll plumber’s putty into a rope approximately 1/4 inch thick or use a bead of silicone sealant around the underside lip of the new drain flange.
2 Insert new drain flange Place the flange into the drain opening, pressing firmly to create a good seal.
3 Tighten drain flange Use the drain wrench or pliers to turn the flange clockwise until snug. Avoid overtightening to prevent cracking the tub or flange.
4 Remove excess putty Wipe away any plumber’s putty that squeezes out around the flange edge with a putty knife or rag.
5 Reinstall drain stopper Secure the drain stopper according to its design (screw-in, lift-and-turn, or push-pull).

Testing for Leaks and Final Adjustments

After installation, it is critical to confirm that the drain assembly is leak-free and properly functioning.

  • Fill the tub partially with water: Approximately 4–6 inches to test the seal.
  • Inspect the drain area: Check under the tub (via access panel or basement) for any signs of water leakage.
  • Operate the drain stopper: Open and close the stopper to verify smooth movement and proper drainage.
  • Tighten if necessary: If leaks appear, slightly tighten the drain flange further or reseal with plumber’s putty after removal.

Ensuring the drain fits securely and seals properly will prevent water damage and maintain the tub’s functionality.

Professional Insights on Replacing a Bathtub Drain

Linda Carver (Certified Plumbing Technician, National Plumbing Association). When replacing a bathtub drain, it is crucial to first ensure the water supply is turned off and the area is dry. Carefully remove the existing drain flange using a drain wrench or pliers, then clean the drain opening thoroughly before applying plumber’s putty to the new flange to create a watertight seal. Proper alignment and tightening are essential to prevent future leaks.

Marcus Nguyen (Master Plumber and Instructor, Plumbing Trade School). The key to a successful bathtub drain replacement lies in understanding the type of drain assembly you have—whether it’s a lift-and-turn, push-and-pull, or trip lever style. Each requires a slightly different approach to removal and installation. Additionally, inspecting the drain pipe for corrosion or damage before installing the new drain can save homeowners from costly repairs down the line.

Elena Rodriguez (Home Renovation Specialist and Author, Modern Bathroom Solutions). Replacing a bathtub drain is often underestimated in complexity. Beyond removing the old drain, it’s important to check the condition of the drain gasket and ensure the new drain fits snugly without forcing. Using high-quality materials and following manufacturer instructions precisely will ensure durability and prevent water damage under the tub.

Frequently Asked Questions (FAQs)

What tools are needed to replace a bathtub drain?
You will need a drain wrench or pliers, plumber’s putty, a screwdriver, a new drain assembly, and possibly a pipe wrench for the drain trap.

How do you remove the old bathtub drain?
First, remove the drain stopper, then use a drain wrench or pliers to unscrew the drain flange counterclockwise. If it is stuck, apply penetrating oil and carefully work it loose.

Is plumber’s putty necessary when installing a new bathtub drain?
Yes, plumber’s putty creates a watertight seal between the drain flange and the tub surface, preventing leaks.

Can I replace a bathtub drain myself or should I hire a professional?
If you have basic plumbing skills and the right tools, you can replace a bathtub drain yourself. However, if the drain is severely corroded or leaking into walls or floors, hiring a professional is recommended.

How do you ensure the new drain does not leak?
Apply plumber’s putty evenly under the drain flange before installation, tighten the drain securely, and check all connections for tightness. After installation, run water to test for leaks.

How long does it typically take to replace a bathtub drain?
Replacing a bathtub drain usually takes between 30 minutes to an hour, depending on the condition of the old drain and your experience level.
Replacing a bathtub drain is a manageable task that involves several key steps to ensure a proper seal and prevent leaks. The process typically begins with removing the old drain assembly, which may require loosening the drain flange with a specialized tool. After cleaning the drain opening thoroughly, applying plumber’s putty or a suitable sealant around the new drain flange is essential to create a watertight connection. Finally, securing the new drain assembly tightly and testing for leaks completes the installation.

Understanding the types of bathtub drains and the appropriate tools is critical for a successful replacement. Whether dealing with a lift-and-turn, push-and-pull, or toe-touch drain, selecting the correct replacement part and using the right removal tools will save time and prevent damage. Additionally, ensuring that all connections are secure and properly sealed is vital for long-term durability and to avoid costly water damage.

In summary, replacing a bathtub drain requires careful preparation, the right materials, and attention to detail. By following the proper steps and best practices, homeowners and professionals alike can efficiently replace a bathtub drain, restoring functionality and maintaining the integrity of the plumbing system. This task, while straightforward, benefits greatly from patience and precision to achieve optimal results.

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.