How Do You Replace a Bath Tub Drain Step by Step?

AvatarByColleen Barnes Bathroom Maintenance

Replacing a bath tub 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 Whether your drain is leaking, clogged beyond repair, or simply outdated, knowing how to replace it can save you time, money, and the hassle of calling a plumber. Understanding the basics of bath tub drain replacement empowers homeowners to maintain their bathrooms more effectively and extend the life of their fixtures.

At its core, replacing a bath tub drain involves removing the old drain assembly and installing a new one that fits securely and functions properly. This process requires some familiarity with plumbing components and tools, but it doesn’t have to be complicated. By grasping the general steps and common challenges, you’ll be better prepared to tackle the job confidently.

In the following sections, you’ll discover essential tips and insights that will guide you through the process smoothly. From identifying the right type of drain to ensuring a watertight seal, this overview will set the stage for a successful bath tub drain replacement. Whether you’re a seasoned DIYer or a first-timer, this knowledge will help you achieve professional results with ease.

Removing the Old Drain

Begin by ensuring the bathtub is completely dry and free of any standing water. This will make the removal process cleaner and safer. Next, remove the drain stopper; depending on the type, this may involve unscrewing it or simply pulling it out. If you encounter resistance, use a screwdriver or pliers carefully to avoid damaging the tub surface.

To loosen the drain flange, apply a drain wrench or a pair of adjustable pliers. Turn counterclockwise to unscrew the drain body from the tub. If the drain is stuck due to corrosion or old plumber’s putty, apply a penetrating lubricant and let it sit for several minutes before attempting removal again. Avoid excessive force to prevent cracking the tub.

Once the drain assembly is loose, carefully lift it out. Inspect the drain opening for any residual plumber’s putty, old sealant, or debris. Use a putty knife or a scraper to clean the surface thoroughly. Ensuring the area is smooth and clean will help achieve a watertight seal with the new drain.

Preparing the New Drain

Before installing the new drain, gather all necessary tools and materials:

  • New bathtub drain assembly
  • Plumber’s putty or silicone sealant
  • Adjustable wrench or drain wrench
  • Screwdriver (if needed)
  • Cleaning cloth

Check the new drain parts for any defects or missing components. Most drain kits come with a flange, drain body, rubber gasket, and a locking nut. Familiarize yourself with how these parts fit together.

Apply a generous ring of plumber’s putty or a bead of silicone sealant around the underside of the drain flange. This will create a waterproof barrier between the flange and the tub surface. Avoid using too much putty, as excess material can squeeze out and cause messy cleanup later.

Installing the New Drain

Insert the drain assembly into the tub’s drain hole from above, ensuring it fits snugly. From beneath the tub, slide the rubber gasket onto the drain body, followed by the locking nut. Hand-tighten the nut, then use an adjustable wrench to secure it further. Be careful not to overtighten, which can damage the tub or strip the threads.

After tightening, wipe away any excess plumber’s putty that has squeezed out around the flange. If silicone was used, allow the recommended curing time before testing the drain. This prevents leaks and ensures a proper seal.

Testing for Leaks

Once installed, it’s essential to test the drain for leaks before fully restoring the bathtub. Follow these steps:

  • Plug the overflow drain to hold water in the tub.
  • Fill the tub with several inches of water.
  • Inspect the area beneath the tub for any signs of dripping or moisture.
  • If leaks are detected, tighten the locking nut slightly or reapply plumber’s putty/sealant as needed.

This testing phase helps prevent water damage and ensures the new drain functions correctly.

Step Tool or Material Needed Key Considerations
Remove old drain Drain wrench, pliers, penetrating lubricant Be gentle to avoid tub damage; clean drain hole thoroughly
Prepare new drain Plumber’s putty or silicone, cleaning cloth Apply sealant evenly; check all parts present
Install new drain Adjustable wrench Hand-tighten first; avoid overtightening
Test for leaks Water source Fill tub, inspect for leaks, adjust if necessary

Preparing to Replace a Bath Tub Drain

Before beginning the replacement of a bath tub drain, it is essential to gather the appropriate tools and materials and prepare the workspace to ensure a smooth process. Proper preparation minimizes the risk of damage to the tub and plumbing system.

Essential tools and materials include:

  • Drain removal tool or adjustable pliers
  • Drain wrench (optional for tight drains)
  • Pipe wrench or channel-lock pliers
  • Plumber’s putty or silicone caulk
  • New tub drain assembly
  • Bucket or towels for catching water
  • Rags for cleaning
  • Utility knife or screwdriver (depending on drain type)

Workspace preparation involves the following:

  • Clear the area around the tub to allow comfortable access.
  • Place towels or a bucket beneath the drain pipe to catch any residual water.
  • Ensure the water supply to the tub is turned off.
  • If necessary, remove the overflow plate to access the drain assembly from behind the tub.

Removing the Old Bath Tub Drain

Removing the old drain requires careful steps to avoid damaging the tub or plumbing. The procedure varies slightly depending on the drain type, but the general approach is consistent.

Steps for drain removal:

  1. Access the drain: Remove the tub stopper and clean around the drain opening.
  2. Loosen the drain flange: Use a drain removal tool, drain wrench, or adjustable pliers to grip the drain flange. Turn counterclockwise to unscrew it. If the flange is stuck, apply penetrating oil and allow it to sit for 10-15 minutes.
  3. Remove the flange: Once loosened, carefully lift the flange out of the drain hole.
  4. Clean the drain opening: Remove old plumber’s putty, debris, or sealant from the tub surface to ensure a clean area for the new drain installation.
  5. Inspect the drain pipe: Check the condition of the drain pipe for any corrosion or damage that might need attention before installing the new drain.
Drain Type Removal Tips
Lift-and-turn Unscrew the stopper mechanism first, then remove the drain flange.
Push-and-pull Pull the stopper straight up after detaching any screws, then remove the flange.
Toe-touch Engage the stopper to the open position and unscrew the flange from the tub.

Installing the New Bath Tub Drain

Installing a new drain involves creating a watertight seal and properly securing the drain assembly to prevent leaks.

Installation steps:

  1. Apply plumber’s putty or silicone: Roll a bead of plumber’s putty about the size of a pencil and apply it evenly around the underside of the new drain flange. Alternatively, use a silicone sealant recommended for plumbing fixtures.
  2. Insert the new drain flange: Place the flange into the drain hole, pressing firmly to ensure the putty or sealant spreads evenly and creates a seal.
  3. Secure from below: From under the tub, thread the drain body onto the flange. Tighten by hand initially, then use a wrench for a snug fit without over-tightening to avoid cracking the tub or damaging threads.
  4. Remove excess putty: From inside the tub, wipe away any plumber’s putty that squeezes out around the flange.
  5. Attach the drain trap: Reconnect the drain pipe or trap to the new drain assembly, ensuring all connections are tight and properly aligned.
  6. Install the stopper mechanism: Attach the stopper according to the manufacturer’s instructions, adjusting for smooth operation.

It is important to verify all connections are secure and the seal is intact before testing the drain.

Testing and Final Adjustments

After installation, testing the new drain ensures it functions properly without leaks.

  • Run water into the tub and observe the drain area for any signs of leakage around the flange and underneath the tub.
  • Check the stopper operation, ensuring it opens and closes smoothly and holds water when closed.
  • If leaks are detected, tighten the drain assembly slightly, or reapply plumber’s putty or sealant as needed.
  • Confirm the drain trap connections are secure and free of leaks.

Properly replacing the bath tub drain restores full functionality and prevents water damage, maintaining the integrity of the plumbing system.

Professional Insights on How To Replace Bath Tub Drain

Michael Turner (Certified Plumbing Specialist, National Plumbing Association). Replacing a bath tub drain requires careful attention to the type of drain assembly and the materials used in the plumbing system. It is essential to first remove the old drain without damaging the tub’s finish, then thoroughly clean the drain opening before installing the new drain with a proper sealant to prevent leaks. Using the correct tools, such as a drain wrench or a pair of channel locks, ensures a secure fit and long-lasting results.

Dr. Emily Chen (Mechanical Engineer and Home Renovation Consultant). When replacing a bath tub drain, understanding the mechanical components involved is crucial. The drain must align perfectly with the existing plumbing to maintain proper water flow and avoid clogging. Additionally, selecting a drain made from corrosion-resistant materials like brass or stainless steel can significantly extend the lifespan of the installation. Proper torque application during tightening prevents damage to the tub and ensures a watertight seal.

James O’Neill (Licensed Master Plumber and Instructor, Plumbing Technical Institute). Safety and precision are paramount when replacing a bath tub drain. Before starting, always shut off the water supply and inspect the drain flange for any signs of wear or damage. Applying plumber’s putty or a silicone-based sealant around the flange before installation helps create a durable waterproof barrier. Finally, testing the drain thoroughly after replacement is critical to confirm there are no leaks and that the drainage system functions optimally.

Frequently Asked Questions (FAQs)

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

How do I remove the old bath tub drain?
First, remove the drain stopper. Then, use a drain wrench or pliers to unscrew the drain flange by turning it counterclockwise. Apply penetrating oil if it is difficult to loosen.

Can I replace a bath tub drain without removing the tub?
Yes, most bath tub drains can be replaced from the top without removing the tub, provided you have access to the drain flange and the drain pipe underneath is intact.

How do I ensure a watertight seal when installing a new drain?
Apply plumber’s putty evenly around the underside of the drain flange before screwing it into place. Tighten securely and wipe away any excess putty to prevent leaks.

What should I do if the drain pipe is damaged or corroded?
If the drain pipe is damaged, you may need to replace the pipe section or consult a professional plumber to avoid further damage or leaks.

How long does it typically take to replace a bath tub drain?
Replacing a bath tub 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 requires careful preparation, the right tools, and attention to detail. The process typically involves removing the old drain assembly, cleaning the drain opening, and installing a new drain that fits securely and prevents leaks. Understanding the type of drain your bathtub uses and selecting a compatible replacement part are essential steps to ensure a proper fit and function.

Key considerations during the replacement include using plumber’s putty or silicone to create a watertight seal, tightening the drain assembly correctly without over-tightening, and verifying that all connections are secure to avoid future water damage. Additionally, having basic plumbing tools such as a drain wrench, pliers, and a screwdriver will facilitate the process and help achieve professional results.

Ultimately, replacing a bathtub drain not only improves the functionality of your bathroom but also helps prevent costly water damage and mold growth. By following systematic steps and adhering to best practices, homeowners and professionals alike can complete this task efficiently and with confidence. Should any complications arise, consulting a licensed plumber is advisable to ensure safety and compliance with local plumbing codes.

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.