How to Replace a Corroded Shower Drain Pipe

What You'll Need
PVC Pipe Straight Connector
PVC Pipe Elbow
PVC Pipe Connector
PVC Pipe 6 inch
PVC Pipe Cement

A shower drain pipe over a period of time will become corroded and rusted and will be in definite need of replacement. The results of a corroded shower drain pipe can cause serious damage to your home if the water from your shower or bath is not properly carried into the drainage system. However, at first notice of a leaking shower drain pipe, you can inexpensively replace the pipe on your own with the proper materials and instructions. Use the steps below to replace your corroded shower drain pipe.

Step 1 - Shut Off Water Supply

Before you begin any type of plumbing work, it is always best practice to restrict the water supply to the area in which you will be working. Shut off water valves to the plumbing system in your bathroom so that you can keep as much water as possible from getting on your floor or on your body while working. 

Step 2 - Disassemble Shower

In order to get to the existing drainage system, it is necessary to disassemble parts of your shower. First unscrew the drain lid and place it in a central location. Next, you will want to unscrew and remove the hot and cold water knobs. Unscrew the shower head from the shower spout and place all items away from you to prevent from losing them.

Step 3 - Remove Shower Parts and Piping

After removing all other existing parts, firmly lift the shower stall from the shower drain. You should now be able to see the floor beneath the shower and the PVC pipe with the existing shower drain piping. Your draining system is constructed that your shower drain connects to the top of the PVC elbow. On the other side of the elbow is where the PVC pipe connects to the main drainage pipe. From the edge of the PVC elbow that connects to the main drainage pipe, measure approximately 4 inches down and cut the pipe with your hacksaw. Remove the piping.

Step 4 - Prepare and Install New Piping

After removal of old drainage piping, apply PVC cement to each end of the new straight PVC connector piping. Place one end of the straight connector onto the main drainage pipe. You many now take the 6 inch straight PVC pipe and connect it to the other end of the straight connector. With PVC cement on both ends of the elbow, connect it to the end of the 6 inch straight pipe and ensure the elbow is facing up. You may now place the PVC shower drain connector inside the elbow. 

Step 5 - Reassemble Shower

You may now reassemble shower in the reverse order of Step 2. Inspect the hot and cold water knobs and their base for any defective threads before reinstalling. If the threads are defective, now is the best time to replace the knobs. Once all parts are assembled, restore water to the shower and test for leaks.