Ключевые слова: abstract, background, blue, build, building, canalization, circle, connection, construction, drain, drainage, engineering, equipment, housing, industrial, industry, isolated, manufacturing, material, metal, new, nobody, pipe, pipeline, pipes, pipework, piping, plastic, plumber, plumbing, pvc, repair, round, sanitary, sewage, sewer, sewerage, stack, supply, system, technology, tool, tube, tubing, water, white, work,