A reducer and a coupling serve two entirely different mechanical functions in piping and flooring systems and are definitely not the same thing. A coupling is a fitting designed to connect two pipes or flooring sections of identical diameter or thickness together in a straight, continuous line. In contrast, a reducer is a specialized fitting or transition molding used to connect two pipes or flooring surfaces of different heights or diameters together smoothly. While couplings maintain uniform dimensions, reducers bridge gaps between mismatched sizes or bridge height differences between adjacent flooring materials like tile and carpet.
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