How to Replace a P-Trap
Over time, a P-trap (the curved drain pipe underneath a sink) can corrode, leak, or become permanently clogged. You can, however, replace it fairly easily if you size the new one properly. Learn how to replace a P-trap in this video by The Home Depot:
You will need the following tools and materials:
- Sink trap / P-trap (NOTE: To ensure a proper fit, the new P-trap must be the same size as the old trap)
- Electrician’s slip joint pliers
- Pipe lubricant
- Slip washers
- Nuts
- Bucket (optional)
- Pipe putty/sealant (optional)
- Hacksaw (optional)
1. Remove the old drain assembly from the top down. Use your pliers to remove any stubborn slip nuts. Keep a bucket handy to catch any standing water in the assembly.
2. Attach the new tailpiece. In a kitchen, you’ll put the tailpiece washer into the flared end and screw the slip nut onto the sink strainer. In a bathroom, you may need to cut the tailpiece to the proper length.
3. A double basin sink will require a T-fitting to join the two tail pieces. To do this, first attach the fitting with slip washers and nuts, then apply pipe lubricant on the slip washer to ensure a tighter fit. Make sure the beveled sides of the washers are facing the threaded portion of the pipes.
4. Attach the trap arm to the drain stub out. Screw on your slip nut and washer, making sure to keep the beveled side of your washer face up. If necessary, use a hacksaw to cut the trap arm to size.
5. Attach the trap bend to the trap arm using slip nuts and washers. Use slip joint pliers to tighten all the nuts, being careful not to over-tighten, which can cause cracking. Never use Teflon tape on white plastic pipe threads and fittings.
6. With your new P-trap installed, turn on the water and check for leaks.
