How Do You Put a Drain in a Bathtub?

AvatarByColleen Barnes Bathroom Maintenance

Installing a bathtub drain might seem like a straightforward task, but it plays a crucial role in ensuring your bathroom functions smoothly and remains free from leaks or clogs. Whether you’re renovating an old tub or installing a new one, understanding how to properly put a drain in a bathtub is essential for both DIY enthusiasts and professional plumbers alike. A well-installed drain not only guarantees efficient water flow but also helps maintain the integrity of your bathroom’s plumbing system.

The process of putting a drain in a bathtub involves more than just fitting a simple piece of hardware. It requires careful preparation, the right tools, and knowledge of how the drain components interact with your tub and plumbing. From selecting the appropriate drain type to ensuring a watertight seal, each step contributes to a successful installation that will stand the test of time.

In this article, we’ll explore the fundamental aspects of bathtub drain installation, offering you a clear understanding of what’s involved before diving into the step-by-step details. Whether you’re tackling this project yourself or just want to be informed before hiring a professional, you’ll gain valuable insights that will make the process smoother and more efficient.

Preparing the Drain Area

Before installing the drain, ensure the bathtub and surrounding area are clean and free of debris. Check the drain hole in the tub for any damage or irregularities that could affect the seal. If the hole is rough or uneven, use fine sandpaper to smooth the edges carefully.

Gather all necessary tools and materials, including the drain assembly, plumber’s putty or silicone sealant, adjustable wrench, and plumber’s tape. Proper preparation helps create a watertight seal and prevents leaks.

Make sure the bathtub is positioned correctly and securely supported. The drain installation is much easier when the tub is stable and not shifting.

Installing the Drain Assembly

Start by applying a generous bead of plumber’s putty or a ring of silicone sealant around the underside flange of the drain fitting. This creates a watertight seal between the drain and the tub surface.

Insert the drain fitting into the drain hole from inside the tub. Press firmly to ensure the putty or sealant spreads evenly and fills any gaps.

From underneath the tub, thread the rubber gasket and mounting nut onto the drain fitting. Hand-tighten the nut, then use an adjustable wrench to securely fasten it without overtightening, as this could crack the tub or damage the seal.

Wipe away any excess plumber’s putty that oozes out from around the drain flange on the tub surface. This will keep the installation neat and prevent buildup.

Connecting the Drain to the Plumbing

Attach the tailpiece of the drain assembly to the bathtub drain outlet. This is typically done by threading the tailpiece into the drain fitting’s threaded end or securing it with a slip nut and washer.

Connect the tailpiece to the trap using the appropriate fittings, such as a slip joint or compression fitting. Ensure all connections are tight and properly aligned to avoid leaks.

Use plumber’s tape on threaded connections to enhance the seal. Avoid excessive force when tightening, as this can damage fittings or cause misalignment.

Check the drainpipe for any blockages or debris before finalizing the connection. A clear drain path ensures proper water flow and prevents future plumbing issues.

Testing the Drain Installation

Once all connections are secure, run water into the tub and observe the drain for leaks. Fill the tub sufficiently to check the drain flange seal and the plumbing connections underneath.

If leaks are detected, tighten connections gradually and inspect the seals. Reapply plumber’s putty or silicone if necessary.

To test for slow drainage or partial blockages, allow the water to drain completely and observe the flow speed. Slow drainage may indicate misalignment or debris in the drain line that should be cleared.

Common Drain Types and Compatibility

Different bathtubs may require different types of drain assemblies based on their design and plumbing setup. Understanding the types helps in selecting the right drain for installation.

Drain Type Description Best For Notes
Lift-and-Turn Drain plug operated by twisting a knob Standard bathtubs with easy access Simple to install, requires periodic cleaning
Push-and-Pull Drain plug operated by pushing or pulling a knob Bathtubs needing easy open/close without twisting More mechanical parts, slightly complex installation
Toe-Touch Drain plug operated by pressing with the toe Accessible bathtubs, convenient for hands-free use Requires precise alignment during installation
Trip Lever Drain plug operated by a lever on the overflow plate Older or traditional bathtubs Includes overflow connection, complex plumbing

Selecting a drain assembly compatible with your bathtub model and plumbing system ensures smooth installation and effective drainage.

Tools and Materials Checklist

  • Drain assembly kit (appropriate type for your tub)
  • Plumber’s putty or silicone sealant
  • Adjustable wrench or channel-lock pliers
  • Plumber’s tape (Teflon tape)
  • Screwdriver (if required by drain type)
  • Bucket or towels for catching water
  • Sandpaper (fine grit) for smoothing edges
  • Clean rag for wiping excess sealant

Having all tools and materials on hand prevents delays and helps maintain a professional installation standard.

Selecting the Appropriate Drain Assembly for Your Bathtub

Choosing the correct drain assembly is critical to ensure compatibility with your bathtub and plumbing system. Bathtub drains typically come in various types, including:

  • Lift-and-turn drains: Operated by twisting a knob to open or close the drain.
  • Push-and-pull drains: Opened or closed by pushing or pulling a stopper.
  • Toe-touch drains: Controlled by pressing with a toe to open or close.
  • Trip lever drains: Utilize a lever on the overflow plate to operate a stopper inside the drain pipe.

When selecting a drain assembly, consider these factors:

Factor Details
Drain Size Standard bathtub drains are typically 1.5 inches in diameter; ensure the assembly matches your drain pipe size.
Material Common materials include brass, stainless steel, or plastic; brass and stainless steel offer higher durability.
Compatibility Make sure the drain fits the type of tub (acrylic, cast iron, fiberglass) and the existing overflow assembly if applicable.
Operation Type Choose a stopper mechanism that suits your preferences and ease of maintenance.

Tools and Materials Required for Installing a Bathtub Drain

Having the proper tools and materials ready will ensure a smooth installation process. The following list outlines the essentials:

  • New bathtub drain assembly (compatible with your tub)
  • Plumber’s putty or silicone sealant
  • Pipe wrench or adjustable wrench
  • Drain removal tool or pliers (for removing old drain)
  • Hacksaw or pipe cutter (if pipe modifications are necessary)
  • Bucket or towels (to catch residual water)
  • Rubber gloves (for hygiene and grip)
  • Plumber’s tape (Teflon tape) for threaded connections
  • Flathead screwdriver (for overflow plate and lever assembly)
  • Utility knife (for trimming sealant or putty)

Step-by-Step Procedure to Install a Bathtub Drain

Follow these detailed steps to correctly install a drain in your bathtub:

  1. Remove the existing drain (if applicable):
    • Use a drain removal tool or pliers to unscrew the old drain flange by turning it counterclockwise.
    • Be cautious not to damage the bathtub surface during removal.
    • Clean the drain opening thoroughly, removing any old plumber’s putty or debris.
  2. Prepare the new drain assembly:
    • Apply a generous bead of plumber’s putty or silicone sealant around the underside of the new drain flange.
    • Ensure an even layer to create a watertight seal.
  3. Insert the new drain flange:
    • Place the flange into the drain hole, pressing firmly to seat it evenly.
    • From underneath the tub (if accessible), thread the drain body onto the flange and tighten by hand initially.
  4. Tighten the drain assembly:
    • Use a pipe wrench or adjustable wrench to securely tighten the drain body onto the flange.
    • Take care not to overtighten, which can crack the tub or damage seals.
  5. Remove excess putty or sealant:
    • From the tub surface, clean away any plumber’s putty that has squeezed out around the drain flange.
  6. Reconnect the drain plumbing:
    • Attach the drain pipe to the new drain assembly, ensuring it fits securely.
    • Use plumber’s tape on threaded connections to prevent leaks.
    • Tighten all connections with the appropriate tools.
  7. Test for leaks:
    • Run water into the tub and observe the drain and pipe connections closely.
    • Check underneath for any signs of leakage.
    • If leaks occur, tighten connections or reapply sealant as necessary.

Installing the Overflow Plate and Lever Mechanism

If your bathtub drain uses a trip lever mechanism, the overflow plate and lever must be installed correctly to control the stopper.

  • Attach the overflow plate:
    • Remove the old overflow plate by unscrewing it from the overflow opening.
    • Install the new overflow plate, ensuring the gasket or rubber seal is properly positioned to prevent leaks.

    Professional Perspectives on Installing a Bathtub Drain

    Michael Trent (Licensed Plumbing Contractor, Trent Plumbing Services). Installing a bathtub drain requires precise alignment to ensure proper water flow and prevent leaks. It is crucial to select the correct drain assembly compatible with your tub model and to apply plumber’s putty or silicone sealant effectively to create a watertight seal between the drain flange and the tub surface.

    Dr. Emily Chen (Civil Engineer specializing in Residential Water Systems, WaterFlow Engineering). When putting a drain in a bathtub, attention must be given to the slope of the drain pipe to guarantee efficient drainage and avoid standing water. Additionally, integrating a properly vented drain system is essential to maintain air pressure and prevent slow drainage or siphoning of water traps.

    James Alvarez (Bathroom Remodel Specialist, Home Renovation Experts). From a remodeling standpoint, installing a bathtub drain is not only about functionality but also about accessibility for future maintenance. Using quality materials and ensuring the drain is installed flush with the tub bottom reduces the risk of corrosion and makes cleaning easier, ultimately extending the lifespan of the bathtub installation.

    Frequently Asked Questions (FAQs)

    What tools are needed to put a drain in a bathtub?
    Essential tools include a drain wrench or pliers, plumber’s putty, a screwdriver, a hacksaw (if adjustments are needed), and a bucket to catch water.

    How do I remove the old bathtub drain before installing a new one?
    Use a drain wrench or pliers to unscrew the old drain. If it is stuck, apply penetrating oil and gently tap with a hammer to loosen it before removal.

    What type of drain is best for a bathtub installation?
    A standard tub drain with a flange and stopper mechanism is recommended. Choose a drain compatible with your bathtub material and plumbing setup.

    How do I ensure a watertight seal when installing a bathtub drain?
    Apply plumber’s putty evenly around the drain flange before inserting it into the drain hole. Tighten the drain assembly securely to prevent leaks.

    Can I install a bathtub drain myself, or should I hire a professional?
    If you have basic plumbing skills and the right tools, you can install the drain yourself. However, for complex plumbing or unfamiliar installations, hiring a licensed plumber is advisable.

    How do I test the bathtub drain after installation?
    Fill the tub with water and then release the stopper to check for proper drainage. Inspect underneath for any leaks and tighten connections if necessary.
    Installing a drain in a bathtub requires careful planning, precise measurements, and the right tools to ensure a watertight and functional setup. The process typically involves removing the old drain assembly, cleaning the drain opening, applying plumber’s putty or silicone to seal the new drain flange, and securely tightening the drain components. Proper alignment and sealing are crucial to prevent leaks and maintain the integrity of the bathtub’s drainage system.

    Understanding the specific type of drain compatible with your bathtub and plumbing system is essential before beginning the installation. Additionally, familiarity with basic plumbing principles and local building codes can help avoid common pitfalls and ensure compliance with safety standards. When in doubt, consulting a professional plumber can save time and prevent costly mistakes.

    Overall, installing a bathtub drain is a manageable task for those with moderate DIY skills and the appropriate tools. Attention to detail during each step—from preparation to final tightening—will result in a durable, leak-free drain that contributes to the bathtub’s long-term functionality and user satisfaction.

    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.