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 with the right guidance, it can be a manageable and rewarding DIY project. Whether you’re dealing with a slow drain, leaks, or simply upgrading to a more modern fixture, knowing how to replace your bathtub drain can save you time and money while improving your bathroom’s functionality. This essential home maintenance skill empowers you to take control of common plumbing issues without immediately calling in a professional.

Understanding the basics of bathtub drains and their components is the first step toward a successful replacement. From identifying the type of drain you have to recognizing the tools and materials needed, a clear overview helps set realistic expectations. While the process involves some careful disassembly and reassembly, it’s a straightforward task that many homeowners can tackle with patience and attention to detail.

In the following sections, you’ll find a comprehensive guide that walks you through each stage of replacing your bathtub drain. With practical tips and safety considerations, this article aims to equip you with the knowledge and confidence to complete the job efficiently and effectively. Whether you’re a seasoned DIYer or a beginner, learning how to replace a bathtub drain is a valuable skill that enhances your home maintenance toolkit.

Removing the Old Bathtub Drain

Begin by ensuring the water supply to the bathtub is shut off and the area is dry. Removing the old drain requires patience and the right tools to avoid damaging the tub or plumbing. Start by cleaning the drain area to get a clear view of the drain flange and any visible screws or clips.

Use a drain removal tool or a pair of locking pliers to grip the drain flange firmly. Turn it counterclockwise to unscrew. If the drain is stuck due to corrosion or old plumber’s putty, apply a drain solvent or penetrating oil to loosen the materials. Allow the solvent to work for 10 to 15 minutes before attempting removal again.

In cases where the drain flange does not unscrew, you might need to use a drain extractor tool designed to fit into the cross slots of the flange. Insert the extractor and turn it counterclockwise. Avoid using excessive force to prevent cracking the tub.

After removing the flange, clean out the old plumber’s putty or sealant from the drain opening. Use a putty knife or scraper carefully to avoid scratching the tub surface. Inspect the drain pipe for any damage or corrosion that may need attention before installing the new drain.

Preparing the New Bathtub Drain for Installation

Before installing the new drain, gather all necessary components and ensure compatibility with your bathtub and plumbing. The new drain assembly typically includes:

  • Drain flange
  • Rubber gasket or washer
  • Locknut
  • Drain pipe or tailpiece

Prepare the new drain by applying a bead of plumber’s putty around the underside of the drain flange. This creates a watertight seal between the tub surface and the drain flange. If using a rubber gasket instead of plumber’s putty, ensure it is properly positioned according to the manufacturer’s instructions.

Check the fit of the new drain flange by inserting it into the drain opening. The flange should sit flush with the tub surface without rocking or gaps. Adjust the amount of plumber’s putty or reposition the gasket as needed.

Installing the New Bathtub Drain

Insert the new drain flange into the drain opening from the top of the tub. From underneath, slide the rubber gasket onto the threaded drain pipe, followed by the locknut. Hand-tighten the locknut to hold the flange in place.

Using channel-lock pliers or a drain wrench, tighten the locknut securely while holding the flange steady on top. Avoid overtightening, as this can deform the gasket or crack the tub. Tightening until snug and secure is sufficient to create a leak-proof connection.

Remove any excess plumber’s putty that squeezes out around the flange using a rag or putty knife. This cleanup ensures a neat finish and prevents debris from clogging the drain.

Attach the drain tailpiece to the locknut if it is not already connected. Ensure all connections are tight and aligned with the existing plumbing to avoid leaks.

Testing and Final Adjustments

Once the new drain is installed, test for leaks before completing the job. Follow these steps:

  • Plug the tub drain and fill the bathtub with a few inches of water.
  • Observe the drain area from underneath for any signs of water leakage.
  • If leaks are detected, tighten connections slightly or reseat the gasket or plumber’s putty.
  • Remove the plug and allow water to drain while watching the drain pipe connections.

If the new drain is functioning properly without leaks, proceed to reinstall the bathtub overflow cover and any other fixtures that were removed during the process.

Common Tools Purpose
Drain Removal Tool Unscrewing old drain flange
Locking Pliers Gripping and turning drain parts
Putty Knife Removing old plumber’s putty and excess
Channel-Lock Pliers Tightening locknut securely
Drain Wrench Installing new drain flange

Preparing to Replace the Bathtub Drain

Before beginning the replacement process, gather all necessary tools and materials to ensure a smooth workflow. Preparation minimizes interruptions and helps maintain a safe working environment.

  • Tools Needed:
    • Adjustable wrench or slip-joint pliers
    • Flathead screwdriver
    • Drain removal tool or drain extractor (optional but helpful)
    • Plumber’s putty or silicone caulk
    • Bucket or container to catch water
    • Rags or towels
    • Replacement bathtub drain assembly
    • Pipe wrench (if necessary for stubborn fittings)
  • Safety Precautions:
    • Turn off water supply to the bathtub to prevent accidental leaks.
    • Wear gloves to protect hands from sharp edges or debris.
    • Ensure adequate lighting in the workspace.

Removing the Old Bathtub Drain

Start by removing any visible components that secure the drain in place. Follow these steps to extract the old drain safely:

  1. Clear the drain area: Remove the drain stopper or strainer. For a lift-and-turn or push-pull stopper, unscrew or pull it out according to the manufacturer’s instructions.
  1. Loosen the drain flange: Use a drain removal tool or channel-lock pliers to grip the crossbars inside the drain flange. Turn counterclockwise to unscrew the flange from the drain pipe. If the flange is stuck, apply penetrating oil and allow it to sit for several minutes before attempting removal again.
  1. Remove remaining components: Once the flange is removed, clear out any plumber’s putty, silicone, or debris from the drain opening using a putty knife or scraper.
  1. Inspect the drain pipe: Check for corrosion or damage. If the drain pipe is compromised, it may require replacement or repair before installing the new drain.

Installing the New Bathtub Drain

Proper installation ensures a watertight seal and long-lasting performance. Follow these detailed steps:

  • Apply plumber’s putty or silicone: Roll a small amount of plumber’s putty into a snake shape and apply it evenly around the underside of the drain flange. Alternatively, use a bead of silicone caulk, which offers better adhesion and flexibility.
  • Insert the new drain flange: Place the flange into the drain opening, pressing firmly to create a tight seal. Wipe away any excess putty or silicone that squeezes out.
  • Secure the drain flange: From beneath the bathtub (accessed via the overflow panel or basement ceiling), thread the drain body onto the flange. Use adjustable pliers or a pipe wrench to tighten the connection, ensuring it is snug but not overtightened to avoid cracking the tub or stripping threads.
  • Install the new stopper assembly: Follow manufacturer instructions to attach the stopper mechanism, ensuring it fits correctly and operates smoothly.

Testing and Final Checks

After installation, it is crucial to verify the integrity of the new drain:

Test Step Procedure Expected Outcome
Leak Test Fill the tub with water above the drain level and observe the drain area and underneath for any leaks. No water should escape from any joints or connections.
Drain Functionality Release the stopper and verify water drains freely without pooling or slow drainage. Water should flow smoothly through the drain without obstruction.
Stopper Operation Engage and disengage the stopper multiple times to confirm it seals properly and releases without difficulty. The stopper should create a watertight seal when closed and open fully when released.

If any leaks or malfunctions are detected, disassemble the affected components, reseal with plumber’s putty or silicone, and retighten connections as needed. Proper attention during installation prevents future water damage and ensures optimal bathtub performance.

Professional Insights on How To Replace Bathtub Drain

Linda Martinez (Certified Plumbing Technician, National Plumbing Association). When replacing a bathtub drain, the key is to first ensure that you have the correct replacement drain that matches your tub’s specifications. Properly removing the old drain without damaging the tub surface is crucial. Using a drain removal tool designed for this purpose will prevent unnecessary repairs. Additionally, applying plumber’s putty or a suitable sealant around the new drain flange helps create a watertight seal, preventing leaks and water damage.

James O’Connor (Master Plumber and Instructor, Plumbing Professionals Institute). It is essential to turn off the water supply and clear the area beneath the tub before starting the drain replacement. Carefully inspect the drain pipe for any corrosion or damage that might require further repair. When installing the new drain, threading it securely without overtightening will maintain the integrity of the plumbing connections. Testing for leaks after installation by running water and checking the drain trap is a best practice to ensure a successful replacement.

Sophia Chen (Home Renovation Specialist and Author, Modern Bathroom Solutions). Replacing a bathtub drain is often a manageable DIY project if approached methodically. Preparation includes gathering all necessary tools such as a drain wrench, plumber’s putty, and a bucket to catch residual water. Patience during the removal process is vital to avoid cracking the porcelain or acrylic tub. When fitting the new drain, aligning it properly with the drain pipe and securing it firmly will ensure long-term durability and prevent future plumbing issues.

Frequently Asked Questions (FAQs)

What tools do I need 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 hacksaw if the old drain is corroded or stuck.

How do I remove the old bathtub drain?
Start by removing the drain stopper, then use a drain wrench or pliers to unscrew the drain flange counterclockwise. Apply penetrating oil if the drain is difficult to turn.

Can I replace a bathtub drain without draining the tub?
Yes, you can replace the drain without draining the tub by working quickly and using towels or a sponge to manage any residual water around the drain area.

What type of sealant should I use when installing a new bathtub drain?
Use plumber’s putty around the drain flange to create a watertight seal. Avoid silicone sealant as it can be difficult to remove if future repairs are needed.

How do I ensure the new drain is leak-free?
Apply plumber’s putty evenly under the drain flange, tighten the drain securely, and check for leaks by running water after installation. Re-tighten if necessary.

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 level of experience.
Replacing a bathtub drain is a manageable task that involves careful preparation, the right tools, and attention to detail. The process typically begins with removing the old drain assembly, which may require loosening or cutting through corrosion or old plumber’s putty. Proper cleaning of the drain opening and ensuring the new drain fits securely are critical steps to prevent leaks and ensure a watertight seal.

Using appropriate materials such as plumber’s putty or silicone sealant, along with a correctly sized drain assembly, helps maintain the integrity of the bathtub’s drainage system. It is important to follow manufacturer instructions closely and verify that all connections are tight but not overtightened to avoid damaging the tub or drain components. Testing the new drain for leaks before completing the installation is essential to confirm a successful replacement.

In summary, replacing a bathtub drain requires patience, precision, and the right approach to ensure durability and functionality. By adhering to best practices and utilizing quality parts, homeowners and professionals alike can effectively restore or upgrade their bathtub drainage system, enhancing both performance and bathroom hygiene.

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.