Raises the boiling point for better cooling efficiency, prevents overheating. High pressure cap for radiators raises boiling point of water and keeps your system cooler, longer. The open valve pressure is 1.1kg/cm2& 1.4kg/cm2. Improve radiator cooling performance. The coolant will not boil easily, prevents air bubbles in the block and radiator core with improved heat transfer. Type-S & Type-L.