A complete coupling consists of a plug and a socket (both sold separately) that connect and disconnect quickly. Use them if you need frequent access to a line. All Ring-Lock plugs are compatible with any of the Ring-Lock sockets of the same coupling size, regardless of the pipe size. Plugs and sockets are zinc-plated steel, which is strong and durable. They have fair corrosion resistance, so they should be used primarily in dry environments.

Plugs are also known as nipples.

Sockets have a shut-off valve that stops the flow when the coupling is separated, so air won’t leak from the line. They are push-to-connect style. To connect, push the plug into the socket until you hear a click. To disconnect, twist the sleeve on the socket and pull out the plug. This twist-to-disconnect feature reduces the chance of accidental disconnection.

Note: To ensure a correct fit, make sure that the plug and socket have the same coupling size.