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Stant Lever Radiator Cap
Raising your coolant pressure will raise the coolant boiling point (1psi adds approximately 2°F to the boiling point, depending on your coolant mixture). These high pressure caps help to insure against overheating, and a lever allows you to vent pressure before removing the cap. Before installing a high-pressure cap, have your cooling system inspected and pressure checked to make sure that it can handle the increased pressure.