Most vehicles on the road today require molded coolant hoses which are used to carry coolant between the radiator and the engine block. These molded coolant hoses are curved at the factory to fit specific applications. Because of parts' consolidation, many have cut-off marks showing where to cut the molded coolant hose to fit a number of applications. The molded coolant hose manufacturer's catalog will reference the marks to use, or will note that the hose must be cut to fit. Some hoses are molded to fit specific applications, while others may include special wire spines that allow them to be formed into various shapes. Molded shapes often are necessary for routing coolant hose in crowded engine compartments.