Ключевые слова:
Pipes, Pipe fittings, Sewers, Drainpipes, Drainage, Sewerage, Plastics, Pipework systems, Underground, Polyesters, Concretes, Plastic pipelines, Pipe couplings, Flexibility, Designations, Dimensions, Marking, Strength of materials, Mechanical testing, Crushing tests, Conformity, Quality control, Reinforced materials