391-6399: 40mm Inner Diameter Cap

Description: A Radiator Cap is a critical component of a vehicle's cooling unit. It is typically located on top of the radiator and is designed to regulate the pressure in the cooling system. The cap contains a spring-loaded valve that opens when the pressure in the cooling system exceeds a certain level, allowing coolant to flow into an overflow tank. Attributes: • Prevent the formation of air bubbles which can cause hot spots and lead to breakdown. • Manufactured to precise specifications and are built for durability, reliability, and productivity. Applications: A Radiator Cap is used to regulate pressure, maintain the proper coolant level, and prevent air from entering the unit, mostly used in Cat 1506, and 2806A Engine (Piston), P450-6, 2206, C13, C15, C18, C9, D350, D400, D450, D500, D550, D600, DE550S, DE600S, DE605, DE660, and DE715 Generator Sets.