Ключевые слова: background, build, canalization, cement, concrete, construction, cover, deep, design, dirt, dirty, drain, drainage, equipment, ground, hole, home, house, industrial, industry, inspection, installation, labor, laying, line, metal, outdoor, pipe, pipeline, pipes, plastic, plumber, plumbing, pvc, repair, road, sand, service, sewage, sewer, sewerage, site, supply, system, tube, under, wall, waste, water, well, work,