Keep corrosive water and contaminants off your bearings with an airtight hub chamber. Features an easy to install diaphragm that is pressurized with a hand pump to 5-10 psi. Positive air pressure protects the grease and lets the grease do its job. Air-Tight allows you to totally seal and have an air pressurized hub that gives you the guarantee that no contaminants have entered the hub. An Air-Tight hub gives you “Peace of Mind.” Air caps for the 2,000Lb.(AT-20USS) to 3,500Lb(AT-35USS) Kits are stainless steel.
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