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With the clear plastic cap, you can always see the current Oil Level to be sure that the bearings have enough lubrication before trailering. If the Oil Level is low, the included rubber plug makes adding more oil to the system a breeze.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.