PP black plastic electrical conduit conduit The production of corrugated plastic pipe demands for perfectly working corrugators that are exactly adapted to customers’ needs. This holds true for all pipe dimensions from technical pipe with a diameter of 3 mm up to drainage pipe with a diameter of up to 2,400 mm. This strategic partnership combines the global resources and technical expertise of Kabra Extrusiontechnik, Indian extrusion line maker and Unicor, corrugated pipe equipment maker.