The original engine coolant level sensor module on certain Freightliners fails from corrosion. This Dorman OE FIX replacement is fully encased in protective epoxy for greater reliability. Product Features:Direct replacement - this coolant level module is an exact match for the fit and function of the original moduleUpgraded durability - module is totally encased in protective epoxy to resist environmental damageApplication specific - made for certain Freightliner Century Class model yearsQuality engineering - designed in the United States and backed by decades of automotive aftermarket experience