Replacing a bathtub waste-and-overflow tube is an important plumbing task that helps keep your bathtub draining properly. With some basic tools and a little know-how, you can replace this important tub component yourself. This in-depth guide will walk you through the entire process of removing your old tub shoe assembly and installing a new waste-and-overflow kit.
When to Replace Your Bathtub Waste-and-Overflow Tube
There are a few signs that indicate it’s time to replace your bathtub waste-and-overflow tube:
- Slow or clogged drains: If your bathtub is draining slower than normal or becomes frequently clogged, there may be a buildup of hair, soap scum, and other debris in the waste-and-overflow tube. Replacing it can help get drainage flowing freely again.
- Leaky bathtub: If you notice water leaking from the tub spout when the tub is full, the waste-and-overflow gasket may be worn out. A new tube kit will come with a fresh gasket seal.
- Corroded or damaged tube: Over time, the waste-and-overflow tube may become corroded or damaged from normal wear and tear. A severely corroded or cracked tube should be replaced right away.
- Remodeling project: When undertaking a bathroom remodel, it’s a good idea to replace the tub waste-and-overflow components at the same time. The parts are inexpensive and it allows you to refresh the look.
How a Bathtub Waste-and-Overflow Works
Before learning how to remove and replace your waste-and-overflow tube, it helps to understand how the assembly works.
The main components include:
- Waste-and-overflow tube: This is the main tubing inside the overflow outlet that travels from the tub drain down through the floor. It has a connection point for the overflow pipe.
- Overflow plate: The decorative plate covering the overflow outlet on the inside tub wall. This is removed during replacement.
- Overflow pipe: The vertical pipe that runs from the waste-and-overflow tube up through the overflow plate. This allows excess water to drain as the tub fills.
- Tub shoe: The curved P-shaped fitting at the bottom of the waste-and-overflow tube that connects to the bathtub drain pipe.
- Drain pipes: The drain pipes leading from the tub shoe to the main drain line under the floor.
When open, the tub drain allows water to flow straight down the waste tube, through the P-trap and drain pipes. If the tub overfills, water flows into the overflow tube and out the overflow pipe.
How to Replace a Bathtub Waste-and-Overflow Tube
Replacing a bathtub waste-and-overflow tube involves removing the old assembly and installing a new one. Follow these key steps:
Supplies Needed
- Waste-and-overflow tube kit (match old tube size)
- Adjustable wrench
- Slotted screwdriver
- Plumber’s putty
- Teflon tape
- Rag
- Bucket
- Flashlight
Step 1: Turn Off Water Supply and Drain Tub
The first step is to turn off the hot and cold water supply lines behind the tub before draining it. Locate the shut-off valves and turn them clockwise to shut off the water.
Once the water is off, pull the tub drain plug to empty out any standing water. Have a bucket and rags ready to catch excess water.
Step 2: Disconnect and Remove Overflow Plate
Use a screwdriver to remove the overflow plate screws. Pull the plate away from the tub wall to access the overflow pipe.
Gently pull out the overflow pipe from the waste-and-overflow tube. Set aside the pipe and overflow plate.
Step 3: Disconnect and Remove Old Tub Shoe
Reach into the drain opening with a wrench and loosen the slip-nut connecting the tub shoe to the waste-and-overflow tube.
Twist the tub shoe assembly back and forth while pulling down to disconnect it from the bottom of the tube. Set it aside.
Step 4: Loosen and Remove Old Tube from Tub
Now loosen the tub shoe nut that connects the waste-and-overflow tube to the bottom of the bathtub drain opening. You may need to spray it with penetrating oil first.
Once loose, unscrew the tube nut completely and carefully pull the tube down through the drain opening and out from below the tub.
Step 5: Install New Tub Shoe and Drain Pipes
First, clean off the old plumber’s putty from the drain hole underside. Apply fresh putty evenly around the hole.
Insert new tub shoe gasket into opening and press into putty to seal. Tighten the tub shoe nut securely with a wrench.
Re-attach the drain P-trap pipes to the tub shoe tailpiece, making sure the slip joints are tight.
Step 6: Attach New Tube and Overflow Pipe
Apply Teflon tape to threads on new waste-and-overflow tube. Carefully feed tube up through tub drain hole.
Hand-tighten the tube nut to secure it. Do not overtighten. Wrap pipe threads with Teflon tape too.
Attach the threaded overflow pipe to the new tube. Make sure the o-ring creates a tight seal inside the overflow outlet.
Step 7: Reinstall Overflow Plate
Apply a thin ring of plumber’s putty around the overflow hole on the tub wall. Press the overflow plate into the putty to create a watertight seal.
Screw the overflow plate back into place with screws. Wipe away any excess putty. Let dry completely.
Step 8: Turn Water Back On and Check for Leaks
Turn hot and cold shut-off valves back on. Use a flashlight to inspect tub shoe connections for leaks as the tub fills. Tighten any problem areas.
Once full, allow the tub to drain completely and check operation. With the project complete, relax in your tub!
Tips for Replacing a Bathtub Waste-and-Overflow Tube
Follow these tips for a smooth tub waste-and-overflow tube replacement project:
- Clear access area under tub before starting. Remove any vanity drawers or paneling as needed.
- Line the bucket with a towel to prevent scratching tub enamel when catching water.
- Clean all joint and pipe fitting areas thoroughly before applying new plumber’s putty or Teflon tape.
- When feeding the new tube up through the drain hole, angle it to align with tub shoe nut threads.
- Turn overflow plate screws gently when reattaching it to prevent cracking the porcelain around holes.
- Run a sink or shower on lower floor after finishing, checking beneath for drips that indicate leaks.
- Consider replacing the tub drain stopper mechanism while you have the drain open.
Replacing a bathtub waste-and-overflow tube requires some DIY plumbing skills but saves on hiring a plumber. With the right preparation and materials, you can do it yourself and avoid the hassle of a leaky, clogged, or corroded tub drain.
Frequently Asked Questions About Replacing Bathtub Waste-and-Overflow Tubes
What size waste-and-overflow tube do I need?
Measure the diameter of your existing tub waste-and-overflow tube to match the replacement size. Standard sizes are 1-1/4 inches or 1-1/2 inches. Measure where the tube passes through the tub drain hole.
Does the tub have to be removed to replace the tube?
No, the bathtub does not have to be removed. The waste-and-overflow tube can be accessed and replaced by reaching up through the drain hole while working underneath the tub.
Can I replace just the tub shoe?
You can replace just the tub shoe, but it’s recommended to install a completely new waste-and-overflow assembly for the best results and a watertight seal. The tubes deteriorate over time.
What do I do if the tube nut is corroded stuck?
Apply penetrating oil and let it soak for 15-20 minutes. Tap gently around the nut with a hammer to help break the bond. Take your time loosening it and be patient.
Should I update my tub drain style?
When replacing your waste-and-overflow tube, it’s a smart idea to update your tub drain style at the same time. Many kits include options like toe-tap, pop-up, or cable-driven drains.
How can I prevent premature waste tube corrosion?
Use a tub drain screen and hair catcher to prevent debris buildup. Clean away any hair around the drain assembly regularly. Avoid dumping bath oils and other chemicals directly down the drain.
What plumbing codes apply to bathtub waste-and-overflows?
Most local plumbing codes require tub drains to have an approved overflow assembly and be vented properly. The tubes and pipes must slope towards the drain to prevent water from laying stagnant.
Why is my new bathtub draining slowly?
Check that the P-trap arm leading from the tub shoe is sloped properly without sags. Detach the P-trap under the tub and clean out any debris that may be clogging the waste tube path.
How can I quiet a noisy bathtub drain?
Noisy drains are often from loose joints or pipes banging against framing. Check slip-nuts at the tub shoe and waste elbow for tightness. Use foam pipe insulation around pipes contacting walls.
Conclusion
Replacing a bathtub waste-and-overflow tube is an important task to keep your tub drain flowing freely and prevent leaks. While it may seem daunting, this step-by-step guide shows you how to remove your old assembly and install a new waste-and-overflow drain.
With some basic DIY skills and the proper precautions, you can handle this project yourself and avoid paying for a plumber. Just be sure to turn off the water supply, empty the tub fully, and use quality new parts. Follow the instructions closely for a watertight seal.
Your bathtub will drain like new again, with no slow or sluggish water removal. By periodically inspecting and updating the waste-and-overflow components, you can maintain optimal performance and also refresh the look of your tub drain area. Just be patient during the process and take it step-by-step for a safe and successful waste tube replacement.