High Pressure Radiator Cap - Black - 2.1 Bar - 212-2100Upgrading to a high pressure 1. 6 bar, 1. 8 bar or 2. 1 bar from the stock radiator cap is the simplest and least expensive way to avoid over boiling your engine. Raising your cooling systems maximum operating pressure increases your coolants boiling point, allowing you to ride harder and longer. High temperature, corrosion resistant silicone seals. Universal fit for most Japanese models.