1Applicable Model: The trailer hub bearing dust cap is fit for Vortex hubs with 5 bolts, suitable for boat, engineering, trailer and other hub kits. Please confirm whether it is consistent with the product you need. 2OE Number: The part numbers for reference are 81143, 48355V. Please confirm whether it is consistent with the OE you need to avoid wrong buying and other problems. 3O Ring Design: The trailer wheel hub dust cap cover is equipped with an O ring, can be firmly fixed on the hub to avoid pollution and debris entering the inside of the hub. 4Threaded Cap: The threaded cap design makes it easy to remove and install, and the installation and removal process can be completed without additional tools. 5Durable Material: The trailer axle hub dust cap is made of durable and reliable material, high strength and wear resistant, having long service time.