How to Cap Off a PVC Drainpipe in a Sink Base

Insert a cap onto a detached PVC pipe to prevent leaks.

Polyvinyl chloride, or PVC, is a common component in residential plumbing, especially for sinks. PVC pipes are available in various lengths, along with preformed connectors for attaching the sections. Occasionally, when repairing a sink, you may need to leave a pipe detached. In this case, you can seal off the open end with a rubber cap to prevent water leaks and odors from coming into the home.

Things You'll Need

• Tape measure
• Rubber pipe cap
• Flat head screwdriver

Send to Phone

Brought to you by

Send to Phone

Please enter your 10 digit phone number only.

Send

A link to this article has been sent to the phone number provided.

Close

Reply HELP for help, STOP to end. Message and data rates may apply.

Instructions

1. Place a tape measure on the top opening of the sink pipe and measure the diameter for the rubber pipe cap you will need. These caps, available at plumbing supply and home improvement stores, are black with a wire band.

2. Locate the connector on the wire band, which consists of a screw. Insert a flat head screwdriver into the slot on the screw and turn it counterclockwise to loosen it until the top overlapping band piece slides freely.

3. Turn the cap so that the concave side of the rubber portion faces the top of the sink pipe. Slide it down as far as possible on top of the pipe.

4. Grasp the top overlapping portion of the metal band and pull it through the connector until it is firmly around the outside perimeter of the sink pipe.

5. Insert the flat head screwdriver back into the slot on the screw and turn it clockwise until it is secure.

References

• City of Garland Texas: Wastewater FAQ's
• Fernco: Fernco Qwik Cap Installation (PDF)