Cat® Radiator Coolant Reserve Tank is a reservoir that holds radiator system coolant. Tanks are designed and manufactured to meet the operational needs for Cat® machines. Cat® Reserve Tank has a cap assembly, where a given quantity of coolant is stored and drawn from to cool an engine. Cat® Coolant Reserve Tanks are systematically engineered into the design of every Cat® machine to ensure optimum safety and coolant storage capacities necessary to maximize the amount of hours before a refill is needed.Application:Cat® Coolant Tanks are designed for collecting the radiator coolant. Consult your owner's manual or contact your local Cat® Dealer for more information.