Ensure the thermostat housing gasket on your 2011-2022 Mustang is sealed up tight with this Ford original replacement O-ring! After years of service and abuse, these o-rings deteriorate potentially causing coolant leaks and in turn overheating the engine and possible head gasket failures. This o-ring gasket seals the thermostat to the thermostat housing to ensure coolant goes into your engine and not out of it. Ford produces these from a durable rubber construction that is coolant and chemical resistant just like the factory-installed originals. Don't forget to pick up a new thermostat
while you are replacing the leaking gasket!