The Stant 10243 Engine Coolant Reservoir Cap is a vintage radiator cap designed with a screw-on attachment type. Made of blue plastic with a matte finish, this cap is specifically manufactured in Austria and is not a universal fitment. It is suitable for use in engine cooling systems, providing a reliable sealing mechanism for the coolant reservoir. The Stant brand is known for producing quality automotive parts, making this cap a dependable option for maintaining proper engine temperature regulation.