Ключевые слова:
Drainpipes, Plastic pipelines, Designations, Potable water, Pipes, Water supply (buildings), Pipe fittings, Unplasticized polyvinyl chloride, Pipework systems, Sewers, Water, Polyvinyl chloride, Water supply and waste systems (building, Pressure pipes, Pipe couplings, Valves, Water supply, Pressure, Drainage, Verification, Sewerage, Plastics