A fitting that slips over the ends of two pieces of pipe to join them together.
Couplings are one of the most simple (and inexpensive) types of PVC fittings. They are a small part that connects or “couples” one part to another, usually permanently. They can connect pipe to pipe, pipe to fitting, or even fitting to fitting. Some of them even reduce so you can connect a small pipe to a large pipe or vice versa. Couplings are available with slip or female-threaded ends, depending on what you need them for.