Ключевые слова: abstract, background, blue, build, circle, close up, closeup, concept, construction, dirty, duct, equipment, housing, improve, industrial, industry, infrastructure, maintenance, manufacturing, material, materials, new, old, outdoor, pattern, pipe, pipeline, pipes, piping, plastic, plumber, plumbing, public, pvc, pvc pipe, repair, residential, round, service, size, stack, supply, technology, texture, tool, tube, water, white, work,