The Rhino Bumper-Mount Tote Tank Holder securely holds your Rhino Tote Tank on standard RV bumpers and fits both 4" and 4-1/2" bumpers. It's perfect for RVs without ladders. The holder is constructed of powder-coated steel with zinc-coated hardware for durability. Designed to hold any of the four Rhino Tote Tank sizes (15, 21, 28, and 36 gallons) and is also compatible with most portable waste holding tanks on the market. Includes straps to secure your tote tank in place. Features• Securely holds your Rhino Tote Tank on standard RV bumpers• Fits 4" and 4-1/2" bumpers• Made of powder-coated steel with zinc-coated hardware• Includes straps for securing your tote tank in place• Works with any size Rhino Tote Tank Includes straps for securing your tote tank in place Made of powder-coated steel w/zinc-coated hardware | Camco Rhino Bumper-Mount Tote Tank Holder