How To Replace Bathtub Drain Pipe

Replacing a bathtub drain pipe is a common plumbing project that can be tackled by homeowners with basic plumbing skills. This guide will walk you through the necessary steps to successfully replace a bathtub drain pipe, ensuring a leak-free and functional drain system.

1. Gathering Materials and Tools

Before starting the replacement process, gather the necessary materials and tools. The specific materials may vary depending on the type of drain pipe (ABS, PVC, or copper) and the existing drain system. However, the following are essential tools for most bathtub drain pipe replacements:

Adjustable wrench
Channel-lock pliers
Tubing cutter (for plastic pipes)
Hacksaw (for copper pipes)
Pipe thread sealant tape or compound
New bathtub drain pipe (matching the existing pipe material and size)
New drain stopper (if needed)
Bucket or drain pan
Safety glasses
Gloves

2. Preparing for the Replacement

Before beginning the actual replacement, take the following steps to prepare the area and ensure a smooth process:

Shut off the water supply: Locate the shut-off valve for the bathtub and turn it off. Ensure the water is completely shut off by turning on the bathtub faucet and checking for any flow.
Drain the bathtub: With the water supply turned off, drain the bathtub to remove any remaining water. Use a bucket or drain pan to collect the water and avoid spills.
Remove the drain stopper: If the drain stopper is attached to the drain pipe, remove it to gain access to the pipe connections.
Remove the overflow plate: If the bathtub has an overflow plate, detach it using a screwdriver or pliers. This will expose the drain pipe and allow easier access.

3. Removing the Old Drain Pipe

Once the area is prepared, you can proceed with removing the old drain pipe. Follow these steps carefully:

Disconnect the drain pipe: Locate the connection between the drain pipe and the drain trap. Use an adjustable wrench to loosen the nut connecting the pipe to the trap. Depending on the type of pipe, you may need to use a tubing cutter or hacksaw to cut the pipe at the connection point.
Detach the drain pipe from the bathtub: Loosen the nut connecting the drain pipe to the bathtub outlet. You may need to use channel-lock pliers or an adjustable wrench to loosen the nut. The drain pipe should now be disconnected from the bathtub.
Remove the drain trap: The drain trap is located below the bathtub, and it connects the drain pipe to the sewer line. Carefully remove the drain trap by loosening the connections to the drain pipe and the sewer line. Use a bucket or drain pan to catch any water remaining in the trap.

4. Installing the New Drain Pipe

With the old drain pipe removed, you can now install the new one. Follow these steps:

Connect the new drain pipe to the bathtub outlet: Apply thread sealant tape or compound to the threads of the new drain pipe. Screw the pipe into the bathtub outlet, ensuring a tight connection.
Connect the new drain trap: Attach the new drain trap to the drain pipe and the sewer line. Make sure the connections are secure and tight.
Connect the new drain pipe to the drain trap: Apply thread sealant tape or compound to the threads of the new drain pipe. Screw the pipe into the drain trap, ensuring a tight connection.

5. Testing and Finishing

After installing the new drain pipe, it's crucial to test for leaks and finalize the installation:

Test for leaks: Turn the water supply back on and check all connections for leaks. If you find any leaks, tighten the connections or reapply sealant tape or compound as needed.
Replace the drain stopper and overflow plate: Once the connections are leak-free, reattach the drain stopper and overflow plate. If you're using a new drain stopper, follow the manufacturer's instructions for installation.
Clean up: Dispose of the old drain pipe and other debris properly. Clean up any spills or messes.