Need extra fuel for longer rides?! These Iron Dog inspired 3.6G Auxiliary Fuel Tanks are designed and proven in the roughest and toughest conditions! Fits and works universally on Polaris Matryx chassis, Arctic Cat Catalyst chassis, and Ski-Doo Gen 4/5 models. Adds 3.6 Gallons of fuel capacity, built out of aluminum for extra strength to stack cargo, and Iron Dog tested and proven! The system will use the fuel in the auxiliary tank first then draw fuel from your stock fuel tank. Uses stock tank