How Do You Change a Bathtub Drain Step by Step?

AvatarByColleen Barnes Bathroom Maintenance

Changing a bathtub drain might seem like a daunting task, but with the right guidance, it can be a manageable and rewarding DIY project. Whether your drain is leaking, clogged beyond repair, or simply outdated, replacing it not only improves the functionality of your bathtub but can also enhance the overall bathroom experience. Understanding the basics of how a bathtub drain works and the tools involved sets the stage for a successful upgrade.

Before diving into the process, it’s helpful to familiarize yourself with the common types of bathtub drains and the reasons why you might need to change yours. From simple pop-up drains to more complex trip lever systems, each has its own unique components and installation methods. Knowing what you’re working with will make the task smoother and help you avoid common pitfalls.

This article will guide you through the essentials of changing a bathtub drain, offering insights into preparation, removal, and installation. Whether you’re a seasoned DIYer or a first-timer tackling home repairs, you’ll gain the confidence and knowledge needed to complete this project efficiently and effectively.

Removing the Old Bathtub Drain

Begin by clearing the area around the drain and removing any visible parts such as the stopper or drain cover. If your drain has a pop-up stopper, unscrew it or lift it out following the manufacturer’s instructions.

To extract the old drain flange, you may need a specialized drain removal tool or a pair of locking pliers. Grip the flange firmly and turn it counterclockwise. If it’s stuck due to corrosion or old plumber’s putty, apply a penetrating lubricant and allow it to sit for 10 to 15 minutes before attempting removal again. Avoid using excessive force to prevent damaging the tub surface.

Once the flange is removed, clean the drain opening thoroughly. Use a putty knife or scraper to remove any old plumber’s putty, debris, or corrosion. This ensures a clean surface for the new drain installation and helps prevent leaks.

Preparing the New Drain for Installation

Before installing the new drain, inspect all components to ensure they are complete and compatible with your bathtub. Many drain kits include a flange, rubber gasket, lock nut, and a drain body.

Apply a bead of plumber’s putty or a silicone-based sealant around the underside of the new drain flange. This creates a watertight seal between the flange and the tub surface. Avoid using too much putty, as excess can squeeze out and create a mess.

If the drain kit comes with a rubber gasket, place it on the underside of the tub opening before inserting the drain body from above. This gasket further seals the connection and prevents leaks.

Installing the New Bathtub Drain

Insert the new drain assembly into the drain hole from above the tub. From underneath, slide the rubber gasket and the lock nut onto the drain body and tighten the lock nut by hand. Use a drain wrench or adjustable pliers to securely tighten the lock nut, turning clockwise. Be careful not to overtighten, which can crack the tub or deform the drain assembly.

After tightening, wipe away any excess plumber’s putty that has squeezed out around the drain flange to leave a clean finish.

Check the alignment of the drain assembly and ensure the stopper mechanism operates smoothly if included. Reinstall the stopper or drain cover as per the manufacturer’s instructions.

Testing the New Drain for Leaks

Once the new drain is installed, it’s crucial to verify there are no leaks. Fill the tub with several inches of water and observe the drain area both above and below the tub. Check for any water seeping around the flange or from the piping underneath.

If you notice leaks:

  • Tighten the lock nut slightly more, but avoid overtightening.
  • Reapply plumber’s putty or sealant if necessary.
  • Inspect the rubber gasket for damage and replace if needed.

Allow the water to drain fully, and inspect the drain pipe connections under the tub for any signs of moisture. If the plumbing connections are dry and the drain flange is sealed properly, your installation is complete.

Tools and Materials Needed for Drain Replacement

Tool/Material Purpose
Drain Removal Tool or Locking Pliers Remove the old drain flange
Putty Knife or Scraper Clean old plumber’s putty and debris
Plumber’s Putty or Silicone Sealant Create watertight seal around drain flange
Adjustable Pliers or Drain Wrench Tighten lock nut securely
New Bathtub Drain Assembly Replacement drain components
Penetrating Lubricant (optional) Loosen stuck drain flange

Gathering Necessary Tools and Materials

Before beginning the process of changing a bathtub drain, it is essential to assemble all required tools and materials to ensure a smooth and efficient operation. Having everything on hand prevents interruptions and potential complications during the replacement.

  • Drain wrench or adjustable pliers: Specialized tools designed to grip and remove the existing drain flange without damaging the tub surface.
  • Flathead screwdriver: Useful for prying off drain covers or loosening screws, if applicable.
  • Plumber’s putty: A malleable sealing compound used to create watertight seals between the new drain flange and the tub surface.
  • Replacement bathtub drain assembly: Ensure compatibility with the existing tub drain size and style. Common sizes include 1.5-inch and 1.25-inch drains.
  • Pipe wrench or adjustable wrench: For loosening and tightening plumbing connections under the tub.
  • Bucket: To catch any residual water trapped in the drain during removal.
  • Rags or towels: For cleaning the work area and wiping off excess putty.
  • Utility knife or scraper: To remove old plumber’s putty or sealant residues from the tub surface.
  • Plumbing tape (Teflon tape): To ensure tight, leak-proof threaded connections, if applicable.
Tool/Material Purpose
Drain wrench or adjustable pliers Remove and install drain flange without damaging tub
Plumber’s putty Seal the drain flange to prevent leaks
Replacement drain assembly New drain component to replace the old one
Pipe wrench or adjustable wrench Loosen and tighten plumbing connections
Utility knife or scraper Remove old sealant and clean surfaces

Removing the Existing Bathtub Drain

Proper removal of the old drain is crucial to avoid damage to the bathtub or plumbing system. Follow these expert steps carefully:

Step-by-step removal process:

  1. Clear the work area: Remove any bath mats, soap, or objects near the drain to provide unobstructed access.
  2. Stop water supply: Although not always necessary, turning off the water supply or ensuring the tub is dry prevents accidental water flow.
  3. Remove the drain cover: Depending on the model, unscrew the drain cover or gently pry it off using a flathead screwdriver.
  4. Loosen the drain flange: Insert the drain wrench or adjustable pliers into the drain flange and turn counterclockwise. If the flange is stuck due to old putty or corrosion, apply penetrating oil and allow time to penetrate.
  5. Extract the drain body: Once loosened, carefully unscrew and pull out the entire drain assembly from the tub.
  6. Catch residual water: Place a bucket underneath the drain pipe to catch any trapped water released during removal.
  7. Clean the drain opening: Use a utility knife or scraper to remove old plumber’s putty and debris from the tub surface and drain opening to prepare for the new installation.

Important considerations:

  • If the drain flange is excessively corroded or stuck, avoid excessive force that may damage the tub. Applying heat with a hairdryer or using chemical drain looseners may assist.
  • Inspect the drain pipe for damage or corrosion once the old drain is removed. Replace plumbing components if necessary before installing the new drain.

Installing the New Bathtub Drain

Correct installation ensures a watertight seal and proper drainage. The following guidelines outline the expert procedure for installing a new bathtub drain:

Preparation:

  • Examine the new drain assembly for defects or missing parts.
  • Apply a generous ring of plumber’s putty around the underside lip of the drain flange to create a watertight seal.

Installation steps:

  1. Insert the new drain body: Carefully place the drain flange with putty into the drain opening in the tub.
  2. Secure the flange: From underneath the tub, thread the drain body into the drain pipe by turning clockwise. Use the drain wrench or adjustable pliers to tighten securely but avoid overtightening, which may crack the tub or damage threads.
  3. Remove excess putty: From the top surface of the tub, wipe away any plumber’s putty that squeezed out during tightening.
  4. Apply plumbing tape: If the drain assembly includes threaded connections, wrap Teflon tape around the threads before reassembly to ensure a leak-proof fit.
  5. Reconnect plumbing components: Attach any drain pipes or traps disconnected during removal, tightening all

    Professional Perspectives on How To Change Bathtub Drain

    Michael Turner (Licensed Plumber and Plumbing Instructor). Changing a bathtub drain requires careful attention to the type of drain assembly you have. Begin by removing the existing drain stopper and use a drain removal tool to unscrew the drain flange. It is crucial to clean the drain opening thoroughly before applying plumber’s putty to the new flange to ensure a watertight seal. Proper alignment and tightening without over-torquing will prevent leaks and damage to the tub.

    Dr. Emily Chen (Civil Engineer specializing in Residential Water Systems). When replacing a bathtub drain, understanding the drainage system’s layout is essential. The new drain must be compatible with the existing piping to maintain proper flow and avoid clogs. I recommend inspecting the P-trap and surrounding pipes for corrosion or buildup during the process, as addressing these issues simultaneously can save time and prevent future plumbing problems.

    James Holloway (Home Improvement Consultant and Author). For homeowners tackling a bathtub drain replacement, preparation is key. Ensure you have the correct tools such as a drain wrench and plumber’s putty. Taking the time to remove old putty residue and inspecting the tub’s drain hole for damage will make installation smoother. Additionally, testing the new drain for leaks before finishing the job will help avoid costly repairs down the line.

    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 a bucket to catch any water.

    How do I remove the old bathtub drain?
    First, remove the stopper if present. Then, use a drain wrench or pliers to unscrew the drain flange by turning it counterclockwise. Be careful not to damage the tub surface.

    Can I replace a bathtub drain without draining the tub?
    It is best to ensure the tub is empty before starting. This prevents water spillage and allows easier access to the drain assembly.

    What type of sealant should I use when installing a new bathtub drain?
    Plumber’s putty is commonly used to create a watertight seal between the drain flange and the tub surface.

    How do I prevent leaks after changing the bathtub drain?
    Apply plumber’s putty evenly under the drain flange, tighten the drain securely, and check all connections for tightness. Test by running water and inspecting for leaks.

    Is it necessary to call a professional plumber to change a bathtub drain?
    While many homeowners can replace a bathtub drain with proper tools and instructions, hiring a professional is advisable if you encounter corrosion, damage, or complex plumbing configurations.
    Changing a bathtub drain is a manageable task that involves careful preparation, the right tools, and a clear understanding of the drain’s components. The process typically includes removing the old drain, cleaning the drain opening, and installing the new drain assembly securely to prevent leaks. Familiarity with the types of drains and the use of appropriate sealants or plumber’s putty is essential to ensure a watertight fit and long-lasting performance.

    Key takeaways emphasize the importance of turning off the water supply and thoroughly cleaning the drain area before installation. Using the correct tools, such as a drain wrench or pliers, helps avoid damage to the tub or plumbing fixtures. Additionally, verifying the compatibility of the new drain with the existing plumbing and bathtub model can prevent installation issues and costly repairs down the line.

    Ultimately, while changing a bathtub drain can be completed by a skilled DIYer, consulting professional guidance or hiring a licensed plumber is advisable if unexpected complications arise. Proper installation not only improves drainage efficiency but also enhances the overall hygiene and functionality of the bathtub, contributing to a better bathroom experience.

    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.