Ключевые слова: big, black, circle, construction, corrugated, diameter, drain, drainage, engineering, equipment, extruded, extrusion, flexible, hdpe, helical, hose, industrial, industry, infrastructure, irrigation, large, lies, maintenance, manufacturing, new, olefin, pattern, pe, pipe, pipeline, pipework, piping, plastic, pleated, plumbing, poly, polyethylene, pvc, round, service, sewer, size, street, supply, technology, tube, tubing, water, work,