Superior's tube seals are the perfect solution for those who like to play in the mud. These seals are constructed from billet aluminum and feature two rubber seals that ride against the axleshaft to prevent debris from entering the axletubes. Additionally a grease fitting that allows users to create a grease barrier between the two rubber gaskets. These seals install simply by pressing into the axletube prior to installing the shafts. A light layer of RTV silicone helps ensure they stay put.