Hose Assembly include hoses and hose fittings. Each of these components has an independent rating for operating pressure. The set's maximum working pressure is the lowest working pressure between the fitting and the hose.If you don't need special options or fittings, corrugated metal hose has four basic parts: tube (or hose itself), braid, braid collar, and fittings. Non-braided hoses may work, but most applications require these four-part assemblies.