GReddy S Type 1.3 bar Radiator CapGReddy S Type 1. 3 bar Radiator Cap SpecificationsThis GReddy S Type 1. 3 bar radiator cap is compatible with many OE radiators with standard caps and fits most Nissan Subaru Mazda and some Toyota Mitsubishi and Honda vehicles. Why use a 1. 3 bar cap? A radiator cap rated at 1. 3 bar will open later than an original cap usually rated at 0. 9 or 1. 0 bar thereby increasing the pressure in your cooling system. It increases the boiling point and ensures