Ключевые слова: bell, brown, build, color, construction, drain, drainage, external, industrial, industry, line, making, manufacture, manufacturing, many, materials, orange, pattern, perspective, pipe, pipeline, pipes, piping, plastic, plumber, plumbing, pvc, red, round, row, sanitary, sanitation, several, sewage, sewer, sewerage, shaped, stack, street, system, technology, tube, tubing,