Case | Case-IH 4420 Patriot Radiator & Cooling System Parts. It's a bummer when your 4420 Patriot isn't working for you. Let us help get that Case | Case-IH in great condition with a new radiator, water pump, belt or whatever it needs. Most water pumps listed here are new, but we also offer remanufactured pumps or can often rebuild using your core. Contact us here for details.