Increase the elevation of your rooftop piping with the Roof Top Blox ROD-03 Zinc-Coated Threaded Extension Rod. This pair of extension rods is designed to be used with other Roof Top Blox accessories to elevate piping up to 14 inches. Eight zinc-plated nuts and four zinc-plated washers are included. Can be used with Roof Top Blox height extension (XTB-02), strut channel (STR-04), small pipe roller (ROL-05), and large pipe roller (ROL-06). Extension Rods only - RTB01 Roof Top Blox and all accessories sold separately.