Camco 40559 Heavy-Duty 20lb or 30lb Dual Propane Tank Cover (Polar White) Protects propane gas bottles from flying debris while streamlining the look of your RV Custom molded assembled unit slips over the bottles for a safe and secure fit Updated design provides easier access to gas valves and changeover valves Fits 20 pound or 30 pound steel double tanks Made of heavy-duty polypropylene