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 Japanese plugs are compatible with any of the Japanese sockets, regardless of the pipe size or barbed hose ID. 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, slide the sleeve on the socket forward until the plug ejects.

Plugs and sockets with a barbed end insert into plastic or rubber hose and secure with a clamp or a crimp-on hose ferrule.

One-outlet manifolds create a connection point between two air lines, giving you a spot to plug in power tools away from your air compressor. Manifolds with two or more outlets split air into multiple lines to supply multiple tools or stations.

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