Bags in opaline inflatable PVC film

Thickness 0.30 mm made with high-frequency welding, for flanges diameters of mm 186, 250, 300, 400, 487, 637 and other, variable length according to the client’s request.
In order to ensure a perfect seal on the channeling of the tunnel, they are provided with the end of an NBR O-ring incorporated in the PVC by means of high frequency welding.