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.

No need for a gasket—this hose’s PTFE liner flares out as it passes through the flanges, so your line’s contents never touch the fittings.

Often found in semiconductor manufacturing and other demanding industrial applications, this hose handles nearly perfect vacuum.