Metal cam-and-groove couplings have better durability than plastic cam-and-groove couplings.

Metal hose fittings have better durability than plastic barbed hose fittings.

Couplings are metal, which has better durability than plastic cam-and-groove hose couplings. They consist of a plug and a socket that connect and disconnect quickly. Use them if you need frequent access to a line. To connect, insert the plug into the socket and push the levers down.

Aluminum fittings have good corrosion resistance, but are lighter in weight than brass.