How Do You Replace the Drain in a Bathtub Step by Step?

AvatarByColleen Barnes Bathroom Maintenance

Replacing the drain in a bathtub 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 Whether your drain is leaking, clogged beyond repair, or simply outdated, knowing how to replace it correctly ensures a smooth, watertight seal and prevents future plumbing issues. With the right tools and a bit of patience, you can restore your bathtub’s drainage system to optimal condition.

Understanding the basics of bathtub drain replacement is essential before diving into the process. This involves recognizing the different types of drains, how they connect to your plumbing, and the common signs that indicate a drain needs replacing. Proper preparation and knowledge can help you avoid costly mistakes and ensure that the new drain fits perfectly and functions efficiently.

In the following sections, you’ll discover an overview of the steps involved in removing an old drain and installing a new one, along with helpful tips to make the job easier. Whether you’re a seasoned DIYer or tackling this for the first time, this guide will equip you with the confidence and information needed to successfully replace your bathtub drain.

Removing the Old Bathtub Drain

Begin by ensuring the bathtub and surrounding area are completely dry. This prevents slipping and makes the work easier. Locate the drain stopper or strainer in the tub and remove it, as it often obstructs access to the drain flange.

Next, use a drain removal tool or a pair of adjustable pliers to unscrew the drain flange. If the flange is stuck due to old plumber’s putty or corrosion, applying a penetrating lubricant and allowing it to soak for several minutes can help loosen it. In cases where the flange is severely corroded, you might need to carefully cut it out using a hacksaw blade inserted into the cross slots of the flange.

Once the flange is removed, clean the drain hole thoroughly, removing all residual plumber’s putty, debris, and corrosion. A clean, smooth surface ensures a proper seal when installing the new drain.

Preparing and Installing the New Drain

Before installing the new drain, gather all necessary materials:

  • New bathtub drain assembly
  • Plumber’s putty or silicone sealant
  • Adjustable wrench or drain removal tool
  • Clean cloth or rag

Apply a generous ring of plumber’s putty or silicone sealant around the underside lip of the new drain flange. This creates a watertight seal between the tub surface and the drain flange.

Insert the new drain flange into the drain hole, pressing firmly to seat it evenly. From beneath the tub, screw on the drain body or locking nut, tightening it securely with the appropriate tool. Be cautious not to overtighten, as this can crack the tub or strip the threads.

After the drain is installed, wipe away any excess plumber’s putty that has squeezed out around the flange. Allow any sealant to cure as per manufacturer instructions before testing.

Testing and Final Adjustments

Once the new drain is installed and sealed, run water in the bathtub to test for leaks. Observe the drain area closely from underneath (if accessible) and around the flange for any signs of water seepage.

If leaks are detected, tighten the drain assembly carefully and reapply plumber’s putty or sealant as needed. Check the drain stopper mechanism to ensure it fits and functions properly with the new drain.

Step Common Issues Recommended Solutions
Removing old drain Stuck or corroded flange Use penetrating oil, wait, then unscrew; cut flange if necessary
Cleaning drain hole Residual putty or debris Scrape off thoroughly with putty knife or rag
Installing new drain Leaking flange seal Apply ample plumber’s putty; tighten flange securely
Testing Leaks after installation Retighten assembly; reseal flange if needed

Preparing to Replace the Bathtub Drain

Before beginning the drain replacement process, gather all necessary tools and materials to ensure a smooth workflow. Proper preparation will minimize interruptions and prevent potential damage to the tub or plumbing.

  • Tools Needed:
    • Drain removal tool or adjustable pliers
    • Plumber’s putty or silicone sealant
    • Flathead screwdriver
    • Pipe wrench or channel lock pliers
    • Bucket or container to catch residual water
    • Rags or towels
    • Replacement bathtub drain assembly
    • Pipe thread sealant tape (Teflon tape)
  • Safety Precautions:
    • Turn off the water supply to the bathtub to avoid accidental flooding.
    • Wear gloves to protect your hands from sharp edges and cleaning agents.
    • Ensure adequate ventilation if using chemical cleaners or sealants.

Removing the Old Bathtub Drain

Careful removal of the existing drain assembly is crucial to avoid damaging the tub’s finish or plumbing connections.

Start by clearing water from the bathtub and placing a bucket underneath the drain trap if accessible. Use the following steps:

  • Remove the Drain Cover: Use a flathead screwdriver to unscrew and lift off the drain stopper or cover.
  • Unscrew the Drain Flange: Insert a drain removal tool or adjustable pliers into the drain opening. Turn counterclockwise to loosen and remove the drain flange. If stuck, apply penetrating oil and allow it to soak for 15 minutes before retrying.
  • Clean the Drain Opening: Remove any old plumber’s putty, debris, and corrosion from the drain hole using a putty knife and cleaning cloths.
  • Inspect Drain Plumbing: Check the drain pipe and trap for damage or buildup that may require cleaning or replacement.

Installing the New Bathtub Drain

Proper installation ensures a watertight seal and reliable drainage function.

Step Action Tips
1 Apply Plumber’s Putty or Sealant Roll a rope of plumber’s putty about ¼ inch thick and place it around the underside of the new drain flange. Alternatively, use a silicone sealant compatible with your tub material.
2 Insert Drain Flange Press the flange firmly into the drain hole, ensuring the putty creates an even seal around the edge.
3 Attach Drain Body From underneath the tub, screw the drain body onto the flange. Use a drain wrench or adjustable pliers, turning clockwise until snug. Avoid overtightening to prevent cracking.
4 Seal Threads Wrap Teflon tape around the threads of the drain body to ensure a leak-proof connection with the drain pipe.
5 Reconnect Drain Pipe Reattach the trap and drain piping securely. Tighten slip nuts by hand and then gently with a wrench.
6 Clean Excess Putty Remove any squeezed-out plumber’s putty from around the drain flange using a putty knife or rag.

Testing and Final Adjustments

After installation, it is critical to verify that the drain functions correctly and there are no leaks.

  • Run Water: Fill the tub with a few inches of water and then open the drain to observe flow rate and drainage efficiency.
  • Inspect for Leaks: Check under the tub and around the drain connections for any signs of water leakage.
  • Adjust if Necessary:
    • Tighten any loose fittings carefully.
    • Apply additional sealant if minor leaks are detected.
    • Replace components if leaks persist after adjustments.
  • Test Drain Stopper: Ensure the drain stopper mechanism operates smoothly and seals properly when closed.

Professional Insights on Replacing a Bathtub Drain

Jessica Turner (Licensed Plumber and Home Renovation Specialist). Replacing the drain in a bathtub requires careful attention to both the plumbing connections and the seal to prevent leaks. First, ensure the water supply is turned off and the drain stopper is removed. Then, use a drain wrench or pliers to unscrew the old drain flange. Cleaning the drain opening thoroughly before applying plumber’s putty or silicone sealant is crucial to create a watertight seal when installing the new drain assembly. Proper tightening is essential to avoid damage to the tub or drain pipe.

Michael Chen (Certified Plumbing Inspector, National Plumbing Association). When replacing a bathtub drain, it is important to verify the compatibility of the new drain with the existing drain pipe and overflow system. Many drains come with universal fittings, but older bathtubs may require specialized parts. Inspecting the drain tailpiece and ensuring it aligns correctly with the trap is necessary to maintain proper drainage and prevent clogs. Additionally, testing for leaks after installation by running water through the drain helps confirm a successful replacement.

Linda Garcia (Bathroom Remodeling Consultant and Certified Interior Designer). From a remodeling perspective, replacing the bathtub drain is an opportunity to upgrade to a more efficient or aesthetically pleasing drain cover. Choosing materials that resist corrosion, such as stainless steel or brass, enhances longevity. It is also advisable to consider the ease of future maintenance by selecting drains with removable strainers. Coordinating the drain replacement with other bathroom updates ensures a cohesive look and reduces the need for multiple repairs down the line.

Frequently Asked Questions (FAQs)

What tools are needed to replace the drain in a bathtub?
You will need a drain wrench or pliers, plumber’s putty, a screwdriver, a bucket, and possibly a pipe wrench depending on your drain type.

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 by turning it counterclockwise. Clean the drain opening thoroughly before installing the new drain.

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 bathtub surface, preventing leaks.

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

How do you ensure the new drain does not leak?
Apply plumber’s putty evenly under the drain flange, tighten the drain securely, and check for leaks by running water after installation.

When should I consider calling a professional plumber for drain replacement?
If the drain is corroded, the plumbing underneath is damaged, or you encounter difficulty removing the old drain, it is advisable to hire a professional to avoid further damage.
Replacing the drain in a bathtub is a manageable task that involves careful preparation, the right tools, and attention to detail. The process typically includes 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 integrity of the bathtub plumbing system.

Key steps such as loosening the drain flange with a drain wrench or pliers, thoroughly cleaning the drain area, and correctly applying sealing materials contribute significantly to a successful replacement. Additionally, verifying that the new drain fits the existing plumbing and testing for leaks after installation are essential practices that help avoid future issues.

Overall, replacing a bathtub drain requires patience and precision but can be accomplished by most homeowners with basic plumbing knowledge. When in doubt, consulting a professional plumber ensures the job is done correctly and safely. Proper maintenance and timely replacement of bathtub drains extend the lifespan of bathroom fixtures and prevent water damage.

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.