Ключевые слова: abstract, background, black, brown, bundle, canalization, channel, circle, closeup, conduit, connection, construction, corrugated, culver, detail, drain, drainage, empty, flexible, hose, industrial, industry, isolated, manufacturing, material, nobody, pattern, pipe, pipeline, piping, plastic, plumbing, protection, pvc, round, sewage, sewer, sewerage, site, stack, supply, technology, texture, tube, tubing, waste, wastewater, water,