Assessing the Overflow Tube
The first step is to assess the overflow tube and identify where the leak is coming from.
- Remove the overflow plate or cover on the tub’s exterior to access the overflow tube. This is usually found near the faucet.
- Run some water into the tub and see if you can spot where the water is dripping out. It may be leaking from a loose connection, crack, or hole somewhere along the tube.
- Check where the overflow tube connects to the drain assembly. A loose connection here can cause leaking.
Cleaning and Drying the Tube
Before making any repairs, thoroughly clean and dry out the overflow tube:
- Use a wet rag to wipe away any dirt, residue, or mold.
- Insert a wire coat hanger or pipe cleaner into the tube to remove any debris or clogs.
- Allow the tube to completely dry out. Any remaining water will need to be drained or soaked up with a towel.
Sealing Small Holes and Cracks
If you find a small crack or hole in the plastic tubing, this can often be sealed using epoxy putty or silicone sealant:
- Apply putty or silicone over the hole and smooth it with your finger. Apply a generous amount to ensure a watertight seal.
- Allow the sealant to fully cure and dry as directed on the product instructions. This may take several hours.
- Once dry, test for leaks by filling the tub with water and checking underneath. The sealant should stop any dripping.
Replacing Worn or Damaged Tubes
If the overflow tube is badly cracked or corroded, replacing it completely is the best option:
- Measure the length of the existing tube so you can purchase a replacement of the same size. Bring the old tube to the hardware store with you.
- Disconnect the overflow tube from the drain/shoe assembly and detach it from the overflow opening. You may need to cut it free with a hacksaw.
- Use Teflon tape or pipe sealant on the threads to install the new overflow tube. Make sure all connections are tight.
- Attach the tube at the overflow and drain ends. Make sure it is aligned properly before tightening.
- Test for leaks before reattaching the overflow plate. Adjust any fittings as needed to stop dripping.
Checking Alignment in the Shoe Assembly
If the overflow tube connection at the drain is aligned improperly, it can sometimes leak:
- Disconnect the tube from the shoe and inspect the plastic or rubber gasket. Replace if worn or damaged.
- Check that the gasket fully seals around the tube when reattached. Tighten the nut carefully.
- Verify the bottom of the tube lines up correctly in the drain opening. Adjust as needed.
- Run water into the tub and check for any dripping. The connection should now be leak-free.
When to Call a Plumber
While most overflow tube leaks can be repaired by a DIYer, call in a professional plumber if:
- The leak is coming from inside the tub wall rather than the overflow tube.
- There are mineral deposits or extensive corrosion on the tube that prevent repair.
- The overflow connections cannot be tightened properly or continue leaking after repairs.
- You are unsure how to detach the old tube or install the new one properly.
With some basic maintenance, your bathtub’s overflow tube should give years of drip-free performance. But at the first sign of leaks, address the issue promptly to prevent damage behind your tub.
Frequently Asked Questions About Fixing a Leaky Bathtub Overflow Tube
What are some common causes of an overflow tube leak?
Some common causes include cracked or damaged tubes, loose connections, misalignment in the shoe assembly, buildup of mineral deposits, and corrosion around connection points.
What type of sealant works best for sealing small cracks?
Plumber’s epoxy putty or clear silicone sealant are good options for sealing small cracks and holes in overflow tubes. Make sure to apply enough to fully cover the damaged area.
How can I detach the old overflow tube?
You’ll need to disconnect it at both ends. Unscrew it from the drain/shoe assembly first using tongue-and-groove pliers. Then detach it from the overflow opening, which may require cutting it free with a hacksaw if it won’t unscrew.
Does the new overflow tube need any special preparation?
Apply Teflon tape or pipe sealant to the threads before attaching the new tube. This will help create a watertight seal and prevent leaks. Firmly hand tighten all connections.
What should I do if tightening the connections doesn’t stop the leak?
Take apart the connections and inspect the gaskets. Replace any worn out or damaged gaskets on the overflow tube or drain assembly. Also verify the tube alignment – adjusting it can sometimes fix leaks.
When should I call a professional plumber?
If you can’t access the overflow tube, the leak is in the tub wall, the tube is heavily corroded, or you’re unable to get the connections leak-proof after multiple tries, it’s best to call a plumber.
Conclusion
A leaky overflow tube is one of the most common bathtub repair issues, but fortunately an easy DIY fix in most cases. Assessing the leak, cleaning and prepping the tube, using sealants or replacing if needed, and properly realigning connections can get rid of annoying drips. Pay attention to any gasket issues or stubborn leaks, which may require hiring a pro. But with some persistence and proper materials, you can usually restore your overflow tube to working order in no time.
