How Do You Replace a Bathtub Drain Step by Step?

AvatarByColleen Barnes Bathroom Maintenance

Replacing a bathtub drain might not be the first home improvement task that comes to mind, but it’s an essential skill for maintaining a functional and leak-free bathroom. Over time, drains can become clogged, corroded, or simply worn out, leading to slow drainage, unpleasant odors, or even water damage. Knowing how to replace a bathtub drain empowers you to tackle these issues head-on, saving you the cost and hassle of calling a plumber.

Whether you’re a seasoned DIY enthusiast or a homeowner looking to expand your repair toolkit, understanding the basics of bathtub drain replacement is a valuable step. This process involves more than just unscrewing a few parts; it requires attention to detail, the right tools, and a bit of patience to ensure a watertight seal and smooth operation. By familiarizing yourself with the general approach and common challenges, you’ll be better prepared to handle the task confidently.

In the following sections, we’ll explore the key considerations and essential steps involved in replacing a bathtub drain. From identifying the type of drain you have to selecting the appropriate replacement and executing the installation, you’ll gain a clear overview that sets the stage for a successful DIY project. Get ready to transform a troublesome drain into a smoothly functioning fixture that enhances your bathroom’s comfort and longevity.

Removing the Old Bathtub Drain

Before you can install a new drain, it’s essential to remove the old one carefully to avoid damaging the bathtub or plumbing. Start by clearing any visible debris or buildup around the drain opening. Use a screwdriver or a drain removal tool to unscrew the drain flange, which is the visible part of the drain inside the tub. If the flange is stuck, applying a penetrating lubricant can help loosen any corrosion or mineral deposits.

Once the flange is removed, the drain body may still be lodged in the drain hole. Use pliers or a drain wrench to grip the drain body and twist it counterclockwise to unscrew it from the drain pipe beneath the tub. In cases where the drain is sealed with plumber’s putty or silicone, gently pry around the edges with a putty knife to break the seal.

If the drain is severely corroded or broken, you may need to cut the drain body out with a hacksaw or a rotary cutting tool. Be cautious not to damage the tub surface or the surrounding plumbing during this step.

Preparing the Drain Opening

After removing the old drain, the drain opening must be cleaned and prepared for the new installation. This step ensures a watertight seal and prevents leaks.

  • Remove any remaining plumber’s putty, silicone, or old sealant using a putty knife and a non-abrasive cleaner.
  • Inspect the drain opening for any cracks or damage. Minor chips can be smoothed with fine-grit sandpaper, but larger damage may require professional repair.
  • Clean the area thoroughly with a mild detergent and water, then dry completely.
  • Check the drain pipe’s condition underneath the tub to ensure it is free of rust or obstructions.

Installing the New Bathtub Drain

Installing a new bathtub drain involves assembling the components properly and ensuring a tight seal to prevent leaks. Follow these steps for a successful installation:

  • Apply a generous bead of plumber’s putty or a silicone-based sealant around the underside of the new drain flange.
  • Insert the drain flange into the drain opening, pressing it firmly to create a seal.
  • From underneath the tub, thread the drain body into the flange by turning it clockwise. Use a drain wrench or channel-lock pliers to tighten it securely, but avoid overtightening, which can crack the tub or strip the threads.
  • Clean off any excess plumber’s putty that squeezes out from around the flange.
  • Attach the drain trap and connect it to the existing plumbing according to local plumbing codes.
Component Purpose Installation Tips
Drain Flange Visible part of the drain sealing the tub surface Apply plumber’s putty underneath; press firmly into opening
Drain Body Connects flange to plumbing underneath Thread into flange from below; tighten securely but gently
Plumber’s Putty/Silicone Seals flange to tub; prevents leaks Use enough for a watertight seal; wipe away excess
Drain Trap Prevents sewer gases from entering bathroom Connect properly to plumbing; ensure no leaks

Testing the New Drain

Once the new drain is installed, it is crucial to test for leaks and proper drainage before using the bathtub.

  • Run water into the tub, filling it several inches deep.
  • Observe the drain area for any signs of water escaping from around the flange or underneath the tub.
  • Check the plumbing connections under the tub to ensure no leaks are present.
  • Allow the water to drain fully and verify that the flow is smooth and unobstructed.
  • If leaks are detected, tighten connections gently or reapply plumber’s putty or sealant as necessary.

Testing the drain promptly helps avoid water damage and ensures the new drain functions as intended.

Preparing to Replace a Bathtub Drain

Before beginning the replacement of a bathtub drain, thorough preparation is essential to ensure a smooth and efficient process. Proper tools, materials, and safety precautions must be in place.

Gather the following tools and materials:

  • Drain wrench or adjustable wrench
  • Drain removal tool (such as a drain extractor)
  • Plumber’s putty or silicone sealant
  • New bathtub drain assembly
  • Bucket or towels to catch residual water
  • Rubber gloves
  • Cleaning brush or rag
  • Pipe thread seal tape (Teflon tape), if applicable

Ensure the work area is clear and dry, and shut off the water supply to prevent any accidental leaks or flooding during the process. It is advisable to place a bucket or towels beneath the drain area to catch any water that may spill during removal.

Removing the Old Bathtub Drain

Begin by removing the drain cover or stopper. This may require unscrewing or detaching clips depending on the drain type.

Next, use the appropriate drain removal tool:

  • Drain Wrench Method: Insert the drain wrench into the drain opening, aligning it with the slots or holes of the drain flange.
  • Drain Extractor Tool: Screw the extractor into the drain to gain purchase and twist counterclockwise to unscrew the drain.

If the drain is corroded or stuck, apply penetrating oil and allow it to sit for 10-15 minutes before attempting removal again.

Once loosened, unscrew the drain flange completely and carefully remove it. Expect some residual water to drain out during this step.

Cleaning the Drain Opening and Surrounding Area

After removing the old drain, clean the drain opening meticulously to ensure a proper seal for the new drain assembly.

Task Details Tools Needed
Remove Old Putty or Sealant Scrape away any hardened plumber’s putty or silicone around the drain opening using a putty knife or scraper. Putty knife, scraper
Clean Surface Wipe the drain flange area thoroughly with a rag and mild cleaner to remove dirt and grime. Cleaning rag, mild detergent
Inspect for Damage Check the drain opening and surrounding tub surface for cracks or damage that may require repair before installing the new drain. Visual inspection, flashlight if needed

Ensuring a clean and smooth surface prevents leaks and ensures the longevity of the new drain installation.

Installing the New Bathtub Drain

Follow these steps to install the new drain properly:

  • Apply Plumber’s Putty or Sealant: Roll a small amount of plumber’s putty into a rope and place it evenly around the underside of the new drain flange.
  • Insert the Drain: Position the new drain into the drain opening, pressing firmly to create a watertight seal.
  • Secure the Drain Body: From beneath the tub (if accessible), thread the drain body onto the flange and tighten using the drain wrench or appropriate tool. If the drain is not accessible from below, use a drain tightening tool designed for above-tub installation.
  • Seal Threads: For threaded connections, wrap the threads with pipe thread seal tape before assembly to prevent leaks.
  • Remove Excess Putty: After securing the drain, wipe away any plumber’s putty that has squeezed out around the flange.

Ensure the drain is tightly secured but avoid over-tightening, which can damage the tub or drain assembly.

Testing the New Drain for Leaks

Once installed, test the new drain to confirm it is leak-free and functioning correctly. Follow this checklist:

Test Procedure Expected Result
Water Drainage Run water in the tub for 2-3 minutes and observe the flow down the drain. Water should drain smoothly without pooling or slow drainage.
Leak Inspection Check beneath the tub or around the drain flange for any signs of water leakage. No water should be visible; if leaks appear, tighten fittings or reseal as necessary.
Drain Stopper Function Engage and release the drain stopper to verify it seals and opens properly. Stopper should hold water when closed and release water when open without obstruction.

Address any issues immediately to avoid water damage or future plumbing problems.

Professional Insights on How To Replace A Bathtub Drain

Michael Turner (Master Plumber, Turner Plumbing Services). Replacing a bathtub drain requires careful preparation to avoid leaks and water damage. The key is to first ensure the water supply is turned off and the drain area is clean. Use a proper drain removal tool to avoid damaging the tub surface, and when installing the new drain, apply plumber’s putty evenly to create a watertight seal. Tighten the drain flange securely but avoid overtightening, which can crack the tub.

Linda Chen (Certified Home Improvement Specialist, RenovateRight). When replacing a bathtub drain, it’s essential to check the compatibility of the new drain with your existing plumbing setup. Many homeowners overlook the importance of matching drain sizes and thread types, which can lead to improper fitting and leaks. Additionally, always inspect the condition of the drain pipe beneath the tub before installation to ensure there is no corrosion or damage that could compromise the new drain’s effectiveness.

James Patel (Construction Engineer, AquaBuild Consulting). From an engineering standpoint, the replacement process must consider both the mechanical fit and the long-term durability of the materials used. Opt for drains made from corrosion-resistant metals like brass or stainless steel rather than plastic to extend the lifespan of the installation. Proper alignment and sealing are critical to prevent water infiltration into the subfloor, which can cause structural issues over time.

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 new drain assembly, a screwdriver, and possibly a hacksaw if the old drain is corroded or difficult to remove.

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

Can I replace a bathtub drain without removing the tub?
Yes, most bathtub drains can be replaced without removing the tub. Access is typically gained from inside the tub, but ensure the drain pipe underneath is accessible for proper installation.

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. Avoid silicone sealants as they may interfere with future drain removal.

How do I ensure the new drain does not leak?
Apply plumber’s putty evenly under the drain flange before installation, tighten the drain securely without over-tightening, and check for leaks by running water after installation.

How long does it typically take to replace a bathtub drain?
Replacing a bathtub drain generally takes between 30 minutes to one 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, applying plumber’s putty or a gasket, and installing the new drain securely to ensure a watertight seal. Understanding the specific type of drain and bathtub material is essential to select compatible replacement parts and avoid damage during installation.

Key considerations include ensuring the drain threads match, properly sealing the drain to prevent leaks, and verifying that all connections are tight but not overtightened to avoid cracking the tub or stripping threads. Utilizing appropriate tools such as a drain wrench or pliers can simplify removal and installation. Additionally, testing the drain after installation is crucial to confirm that it functions correctly and that there are no leaks.

In summary, replacing a bathtub drain can extend the life of your bathtub and improve water drainage efficiency. By following a systematic approach and adhering to best practices, homeowners and professionals alike can achieve a durable and effective drain replacement. Proper maintenance and timely replacement of bathtub drains contribute significantly to overall bathroom hygiene and functionality.

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.