This replacement Trailer Oil Cap is designed for 6,000lb to 8,000lb Rated Dexter Brand Axles, that use Oil instead of Grease for their bearing lubrication method. The item includes a new O-Ring, Plug, and the Cap itself. 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. Simply remove the center plug and add oil through the opening.
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