When you are replacing your water pump, it is usually a good idea to replace your thermostat as well. The 4.0L is one unit with the housing and thermostat. These are genuinet, new OEM Toyota units that will last and carry a 12 month unlimited mile warranty.
Fits:
2005+ Tacoma w/4.0L Engine
2003+ 4Runner w/ 4.0L Engine
2007+ FJ Cruiser w/ 4.0L Engine