How to Replace a Tub Drain Pipe and Overflow Tube

What You'll Need
New bath tub drain kit
Silicone caulk and caulk gun
Hack saw
Water softening agent
Pair of pliers
Old towelsor rags

An old bath tub drain can develop leaks and may need to be replaced with a new one. Replacing a tub drain and overflow tube is a great DIY project and is one that you can do in a couple of hours. To make the task even easier, here is an easy to follow step by step guide that will show you everything you need to know. 

Step 1 - Drain and Prepare the Tub

Make sure that all of the water is drained out of the bathtub. Then, take some old rags and lay them at the base of the tub. This will help to protect the enamel on your bathtub while you're working.

Step 2 - Remove Drain Basket

Remove the drain basket from the tub. First, remove the drain cover with a flat head screwdriver, and take a pair of pliers and twist the drain basket counterclockwise. You should then been able to simply pull the basket out.

Step 3 - Remove Overflow Cover and Assembly

To remove the overflow cover, simply remove the two retaining screws. Then, you will need to remove the overflow assembly. To do this, you will need to be able to access the area where the pipes run into your bathtub. Sometimes, you'll be able to simply screw the overflow pipe and assembly off. However, in some cases, you may need to use a hack saw.

Step 4 - Clean the Drain Area

Clean out any dirt and sediment that may have settled into the drain pipes in your plumbing system. Then use the water softening agent to remove mineral deposit build-up, as they can harden the water in your pipes.

Step 5 - Assemble and Install Waste Water Pipe

Refer to the diagram with your drain kit and then assemble the wastewater pipe. Then, place the wastewater pipe so that it lines up with the holes in your bathtub. Again, you may need to take a hack saw to cut the pipe to size so that it will fit.

Step 6 - Caulk the Drain and Seal

Use the caulk gun and some silicone caulk to caulk the rubber drain seal underneath the tub as well as the drain basket. Then, use a pair of pliers to twist the drain basket back onto the pipe that is located underneath the bathtub.

Step 7 - Install Overflow and Stopper Assembly

Install the linkage assembly for the overflow and stopper. You may have to adjust the linkage so that it will line up and fit properly. However, once you find the correct length, you just need to install the cover plate and secure it with the retaining screws.

Step 8 - Install Drain Cover and Finish Up

Install the drain cover on top of the drain basket. In some cases, the drain cover may simply snap into place. Other times, you may need to secure it with retaining screws. Then, patch up any wall damage that occurred when working with the overflow pipe.