Thermostat housing for the 2UZ engine found in the 4th Gen 4Runner, GX479, 100 Series Land Cruiser, Tundra and Sequoia all with the 4.7 2UZ engine. The thermostat housing on some engines seem to be showing advanced levels of electrolysis and should be replaced. Used with the 100 Series 2UZ Thermostat and Gasket set.
