Feature●COMPATIBILITY - iFLEX pipe is compatible with all Roofivent vertical vents and condensation collectors●MULTIPLE REDUCTION - reduction pyramid from 5″ to 4.3″, 4″ and 3″ diameter●EASY & THIGHT - our technical solution ensures easy and tight connection of vertical vent and ventilation system●FLEXIBILITY - pipe flexibility allows free bending without changing the diameter●FLAME RETARDANT - M1 fire resistance classDescription iFLEX - system connection pipe Fits every Roofivent vertical vent in same diameter. Material: Endings - polypropylene Pipe - polyester fabric soaked with modified polyolefin resins with a steel wire helix