With an unobstructed air path, these couplings have better airflow than other coupling shapes of the same size. 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 European plugs are compatible with any of the European sockets, regardless of the pipe size or barbed hose ID. Made of zinc-plated steel, all are strong and durable, have fair corrosion resistance, and should be used primarily in noncorrosive environments.
