A malfunctioning bathtub drain stopper can be a frustrating problem that prevents you from enjoying a relaxing soak. Fortunately, fixing this issue is often a simple task that doesn’t require professional help.
In this guide and accompanying video, This Old House plumbing and heating expert Richard Trethewey demonstrates how to diagnose and repair a faulty bathtub drain stopper.
Understanding Bathtub Drain Assemblies
Bathtub drain assemblies may seem complex, but they operate on a simple principle. A lever above the bottom of the tub controls whether water stays in the tub or drains out when bath time is over.
The standard drain assembly consists of three main components:
- A visible trip lever
- A plunger that seats in the drain to stop water
- Two pieces of threaded rod connecting the lever and plunger
These assemblies are adjustable by design, allowing them to fit a wide range of tub styles and sizes.
Common Causes of Bathtub Drain Stopper Issues
When a tub won’t hold water, there are typically three potential causes: misalignment of the assembly, an improperly seated plunger, or normal deterioration of replaceable components.
We’ll walk you through how to identify and address each issue below.
Misalignment of Components
One of the most frequent issues with bathtub drain stoppers is misalignment of the assembly components–this can occur due to normal wear and tear or improper installation. When the threaded rod, plunger, or trip lever becomes misaligned, the stopper may not create a proper seal, allowing water to drain even when the lever is in the closed position.
Incorrect Plunger Height
Drainage issues can also arise from a plunger set at the wrong height. If the plunger is set too high, it won’t create a tight seal with the drain opening, allowing water to escape. Conversely, if set too low, the stopper may not open fully, leading to slow tub drainage.
Wear and Tear
Over time, the components of a bathtub drain assembly can wear out—this includes the rubber seal on the plunger. After prolonged exposure to the elements, seals become hard and brittle, compromising their ability to create a watertight seal. The threaded rod can also corrode or bend, affecting the stopper’s operation.
Steps To Fix a Bathtub Drain Stopper
Follow these steps to repair your bathtub drain stopper:
- Prepare the work area by placing a drop cloth in the tub to prevent scratching and to catch any screws that might fall.
- Unscrew the plate that holds the trip lever using a slotted screwdriver.
- Carefully pull out the entire stopper assembly.
- Inspect the assembly for any visible damage or misalignment, particularly where the threaded rod articulates.
- To adjust the plunger height, locate the two lock nuts on the threaded rod.
- To lower the stopper, thread the bottom lock nut downward.
- Spin the adapter that the plunger hangs from down until it reaches the bottom lock nut.
- Tighten the upper lock nut against the adapter to secure the new position.
- Reinsert the plunger, threaded rod, and trip lever back into the tub’s drain hole.
- Screw the plate back into place.
- Test the repair by closing the stopper and running some water into the tub.
- If water still drains out, repeat the process and lower the plunger a bit more until the tub holds water effectively.
Trethewey demonstrates these steps in the above video, showing how simple adjustments can often solve the problem.
Troubleshooting Persistent Draining Issues
If adjusting the plunger height doesn’t solve the problem, consider these additional troubleshooting steps.
Checking for Debris
Sometimes, debris can accumulate around the drain opening, preventing a proper seal. To resolve this, remove the stopper assembly and clean the drain area thoroughly. Use a small brush to remove any buildup of soap scum, hair, or other remnants that might interfere with the stopper’s operation.
Inspecting the Seal
Examine the rubber seal on the plunger for signs of wear or damage. You’ll need to replace it if it appears cracked, brittle, or misshapen. Most hardware stores carry replacement seals that are cheap and easy to install.
Lubricating Moving Parts
To get the drain components back in smooth working order and mitigate future corrosion and friction mishaps, apply a small amount of plumber’s grease to the assembly’s moving parts. Be sure to grease the points where the threaded rod connects to the trip lever and plunger, especially.
When To Call a Professional for Your Drain Stopper Issues
While you can resolve most bathtub drain stopper issues with DIY methods, there are situations where professional help may be necessary:
- If you encounter unexpected leaks or water damage during your repair attempts
- If you’ve tried adjusting the stopper multiple times without success
- When dealing with older, non-standard plumbing fixtures that may require specialized knowledge
- When there’s visible damage to the drain or surrounding tub area
Preventing Future Bathtub Drain Issues
To keep your bathtub drain stopper functioning properly, we recommend taking these preventive measures:
- Regularly clean the drain area to prevent buildup of soap scum and debris.
- Avoid using harsh chemical cleaners that can damage rubber seals and metal components.
- Periodically check and tighten any loose screws or connections in the assembly.
- Be gentle when operating the trip lever to avoid placing undue stress on the mechanism.
- Consider installing a drain cover to catch hair and reduce the amount of debris entering the drain.
Signs It’s Time to Replace the Drain Stopper
While piecemeal repairs can fix many drain stopper issues, there are clear signs that a replacement might be a better option. Here’s what to look for.
Persistent Leaks
If you’ve adjusted and cleaned the stopper but it still leaks, the parts may be too worn to function correctly. Replacing the stopper can provide a more permanent solution.
Visible Rust or Corrosion
Over time, metal parts can rust. If you notice significant corrosion on the stopper or its components, replacing it is likely a better solution.
Other Persistent Issues
If you continue to experience problems with your tub drain despite multiple fixes to the drain assembly, it might be time to invest in a new stopper. A full-scale replacement of the stopper ensures reliable performance and can save you from having to perform future repairs.
Our Conclusion
Fixing a bathtub drain stopper is a manageable DIY project for most homeowners that doesn’t require a full tub drain removal. You can often resolve issues quickly and easily with a basic understanding of how the assembly works and some simple adjustments. Regular maintenance and gentle use can help prevent future problems.
