Ключевые слова: abstract, background, blue, build, building, circle, construction, drain, drainage, duct, equipment, factory, improve, industrial, industry, infrastructure, labor, line, maintenance, material, new, pipe, pipeline, pipes, piping, plastic, plumber, plumbing, public, pvc, repair, residential, service, size, stack, supply, texture, tube, tubing, utility, wallpaper, water, work, works,