Fittings are used in various ways to connect different plumbing components. In commercial kitchen appliances, fittings are used extensively to ensure the smooth operation of the plumbing system.Some of the commonly used plumbing fittings in commercial kitchens include elbow fittings, tee fittings, couplings, reducers, and adapters. https://partsfe.com/plumbing-parts/fittings-and-couplings