Replace Trap Under Bathroom Sink

Replace Trap Under Bathroom Sink: A Comprehensive Guide

A bathroom sink trap is a U-shaped pipe located below the sink that holds water to prevent sewer gases from escaping into the bathroom. Over time, the trap can become clogged with hair, soap scum, or other debris, which can lead to slow drainage and unpleasant odors. Replacing the trap is a relatively simple plumbing task that can be completed in about an hour.

Tools and Materials

New trap (same size and type as the old one)
Adjustable wrench
Bucket
Plumber's putty
Rags

Step-by-Step Instructions

1. Turn off the water supply. Locate the water supply valves under the sink and turn them off. Open the faucet to release any remaining water in the pipes.

2. Place a bucket under the trap. This will catch any water that spills out when you remove the trap.

3. Loosen the nuts holding the trap in place. Use the adjustable wrench to loosen the nuts that connect the trap to the sink drain and the drainpipe. Do not remove the nuts completely.

4. Remove the old trap. Carefully pull the old trap straight down to detach it from the sink drain and drainpipe. Be careful not to spill any water.

5. Clean the mating surfaces. Use a rag to clean the mating surfaces of the sink drain and drainpipe. Remove any old plumber's putty or debris.

6. Apply plumber's putty to the new trap. Roll out a small amount of plumber's putty and form it into a rope. Apply the rope of putty around the rim of the new trap where it will meet the sink drain and drainpipe.

7. Install the new trap. Carefully insert the new trap into place, making sure that the plumber's putty forms a seal between the trap and the sink drain and drainpipe. Tighten the nuts hand-tight, then use the adjustable wrench to tighten them further, about 1/4 turn.

8. Turn on the water supply and check for leaks. Turn on the water supply valves under the sink and open the faucet. Check for any leaks at the connections between the trap and the sink drain and drainpipe. If there are any leaks, tighten the nuts further.

Replacing a bathroom sink trap is a simple plumbing task that can be completed in about an hour. By following these step-by-step instructions, you can ensure that the trap is properly installed and that your sink will drain properly.