Additional Mounting Plate for Milwaukee SWITCH PACK CABLE-DRIVE Assembly. Attaching the mounting plate to SWITCH PACK drums allows drum to be compatible with the CABLE-DRIVE Assembly to automatically feed and retract cable through 1-1/4" to 4" lines. The M18 FUEL SWITCH PACK Sectional Drum System is the first drain cleaning solution that combines the benefits of sectional and drum machines, creating the single most versatile and mobile machine on the market. Tackling the most frequent challenge of any drain cleaning application, getting the machine onto the job, the SWITCH PACK System utilizes a modular design with backpack straps for the easiest transport to any roof, drain, crawl space, or cleaNut.