Ключевые слова: abstract, background, blue, build, circle, construction, domestic, drain, drainage, duct, economy, employment, equipment, government, improve, industrial, industry, infrastructure, investment, labor, line, local, maintenance, manufacturing, material, new, pipe, pipeline, pipes, piping, plastic, plumber, plumbing, public, pvc, repair, replace, residential, road, round, service, size, stack, steel, storage, supply, tube, tubing, water, work,