13 CONDUITS, MADE OF POLYMERIC MATERIAL, SUCH AS POLYMERS AND CO-POLYMERS OF POLY-VINYL CHLORIDE, ACRYLONITRILEBUTADIENE-SYRENE, POLYETHYLENE, PHENYLENE OXIDE, CELLULOSE ACETATE, CELLULOSE ACETATE BUTYRATE, STYRENE-RUBBER, POLYSTYRENE AND COPOLYMERS THEREOF