Plumbing pipe fittings are important parts used to connect, turn, divide, reduce, close, or control pipes in a plumbing system. This guide explains common plumbing pipe fittings names and uses in simple words, including elbow, tee, coupling, reducer, adapter, union, cap, plug, valve, and cross fittings. It also helps users understand where each fitting is used in water supply, drainage, SWR, pressure lines, residential plumbing, and commercial piping systems. This guide is useful for homeowners, plumbers, contractors, dealers, and buyers who want to choose the right fitting for a safe and durable pipe installation.