Today's increased water pressure and temperatures require a better seal than stock oil caps can provide. That's why CV4 worked with professional engine builders to develop these new higher pressure radiator caps. The 2.0 bar pressure version is recommended for Slow to Medium woods or GNCC off-road riding to maintain coolant pressure under extreme load conditions. High pressure radiator cap designed for modern racing 4-stroke engines. Allows running a higher water system pressure and higher boiling point coolant. Rated for 2.0 Bar / 30 PSI. Sold individually. Detailed Specifications: Fits most O.E. and aftermarket radiators used on most Japanese models. Note: Will NOT work with KTM, Husaberg, or Husqvarna bikes or ATVs.