Prevents loss of coolant due to overheating on most water-cooled motorcycles, snowmobiles, and ATV's. Designed for hot weather and/or high-altitude riding conditions. Compact, versatile, high density polyethylene bottle with built in mounting holes provide multiple mounting options. Bottle cap is constructed from chemical-resistant rubber for durability and easy installation/removal. Includes 275cc bottle, hose, clamps, mounting ties and instructions.