Prevents loss of coolant due to overheating.Works on most water-cooled motorcycles, snowmobiles, and ATVs.Designed for hot weather and/or high-altitude riding conditions.Compact, versatile, high density polyethylene bottle.Built in mounting holes provide multiple mounting options.Bottle cap is constructed from chemical-resistant rubber for durability and easy installation/removal.Includes 27cc bottle, hose, clamps, mounting ties and instructions.