Ключевые слова: abstract, background, black, blue, build, color, conduit, construction, cylinder, drain, drainage, duct, fitting, fix, gas, home, house, icon, illustration, industry, isolated, line, materials, metal, oil, orange, pattern, pipe, pipeline, pipework, plant, plastic, plumber, plumbing, power, pvc, sanitary, set, sewer, sewerage, site, steel, supplies, tap, technology, tube, water, white, worker,