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How to Install a PVC Coupling

Installing a PVC coupling is relatively straightforward, but the process will vary depending on the type of connection. Once you cut and deburr your PVC pipes, dry-fit the PVC coupling onto the pipe to ensure it fits properly. For most slip couplings, you’ll also want to apply PVC cement. Apply PVC cement to the outside of the pipe ends and the inside of the couplings. Push the pipe into the coupling (or twist with a threaded connection) and wipe off any excess cement. Once the cement cures, test the connection by turning on the water.

PVC Coupling FAQs

What are the most common types of PVC couplings?

Slip couplings and threaded couplings are connectors used to join two pieces of PVC pipe of the same diameter. Where slip couplings are smooth, threaded couplings use a threaded connection on each end. A compression coupling uses a compression ring and nut to secure the connection. Flexible couplings, elbow couplings, and reducing couplings are also rather common.

Can PVC couplings be used underground?

Standard PVC couplings (Slip, Threaded, and Reducing) are all appropriate for underground use, as long as they are installed properly. Use schedule 40 or schedule 80 PVC pipes and fittings, as these are rated for pressure and durability. PVC cement will also help create a lasting connection and a leak-proof seal.

What is the difference between schedule 40 and schedule 80 PVC couplings?

The difference between Schedule 40 and Schedule 80 PVC couplings lies primarily in the thickness of the pipe walls and their pressure ratings. Schedule 80 PVC has thicker walls than Schedule 40, and provides greater resistance to pressure and physical damage. This also means that Schedule 80 PVC has a higher pressure rating.

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