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SWR pipe stands for Soil, Waste and Rainwater pipe. It is an important part of a building drainage system and helps carry toilet discharge, bathroom wastewater, kitchen waste and rainwater from a building to the main drainage or sewerage line. In modern plumbing systems, uPVC SWR pipes are widely used because they are lightweight, corrosion-resistant, easy to install and suitable for long-term drainage applications. This guide explains the full form of SWR pipe, its meaning in plumbing, common uses, Type A and Type B difference, standard pipe sizes and important fittings used in drainage systems. SWR pipes are commonly used in homes, apartments, hospitals, hotels, schools, malls, offices, factories and other building projects where safe and smooth drainage is required. SWR pipes are generally available in Type A and Type B options. Type A pipes are used for rainwater, ventilation and light drainage lines, while Type B pipes are preferred for soil discharge, waste discharge, main drainage lines and heavy-duty drainage applications. Common SWR pipe sizes include 75mm, 90mm and 110mm, where 110mm or 4-inch SWR pipe is commonly used for main soil and drainage lines. Duke Pipes manufactures uPVC SWR pipes as per IS 13592:2013 in Type A and Type B options. These pipes are available with matching fittings such as bends, tees, couplers, reducers, traps, vent cowls and pipe clips for complete drainage system installation. With manufacturing experience since 1998, Duke Pipes supports builders, plumbers, contractors, project buyers, dealers and distributors with reliable uPVC SWR pipe solutions for residential, commercial and selected industrial drainage applications.