Getting the most out of your performance parts comes down to the details. When faced with hard driving conditions, a vehicle's cooling system becomes highly pressurized. Stock caps are not equipped to handle higher pressure, causing fluid to leak out into the overflow reservoir. The Mishimoto High-Pressure 1.3 Bar Radiator Cap is rated at a higher pressure and will keep coolant where it needs to be– flowing within the system. Rated at 1.3 Bar (19lbs) pressure. Fits most domestic vehicles. Raises the boiling point of engine coolant to provide a safer and more efficient cooling system Ergonomically designed for easy removal and installation Installing a new cap can prevent overheating and cooling system failure Pressure Tolerance: 1.3 Bar / Fits: 42mm Fill Necks Mishimoto Lifetime Warranty