McMaster 6534K111 Industrial Quick-Disconnect Hose Coupling for Air, Steel, Plug, 1/2 Coupling Size, 1/4 NPTF Male

A complete coupling consists of a plug and a socket (both sold separately or in a set) that connect and disconnect quickly. Use them if you need frequent access to a line. They are also known as industrial interchange couplings. All Industrial plugs are compatible with any of the Industrial sockets of the same coupling size, regardless of the pipe size or barbed hose ID.

Steel is stronger and more durable than other metals.

Zinc-plated steel has fair corrosion resistance and should be used primarily in dry environments.

NPTF (Dryseal) threads are compatible with NPT threads.

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