Features: 1.OE Number: The referencing OE number of this trailer hub bearing dust cap is 1980 SS, which is applicable for most boats, yachts, trailers. 2.Compatibility: This bearing cap measures 1.980 inches at its base. It is designed to be used in most 4 and 5 bolt hubs, please check before ordering. 3.Function: Put pressure in the hub (about 3psi), when submerged, keep the water out, help keep dirt and water out of your hubs and bearings. 4.Practical: If your trailers are used in saltwater environment or you have to drive a lot on highway, these wheel bearings for trailers are essential for protecting the bearings. 5.Anti Aging: The dust caps is made of high strength stainless steel, durable, high toughness, aging resistant, abrasion and impact resistance. Specification: Item Type: Trailer Hub Bearing Caps_x000D_ OE Number: 1980 SS_x000D_ _x000D_ Material: Stainless steel_x000D_ Application: Suitable for boat, yacht, trailer_x000D_ _x000D_ Installation:_x000D_ Remove the hub and inspect the bearings before mounting. If the bearing is damaged, rusted or dented, replace the bearing. Remove old grease and contaminants from the hub. Check the condition of the internal seals. Make sure they are new, and running on a smooth spindle sealing surface. Important: When you reassemble the part, completely fill the hub with a versatile grade 2 lubricant (for example, the type used in the suspension of a car). Do not use heavy, fibrous grease; Do not mix grease types._x000D_ _x000D_ Use a small piece of wood to secure the bearing to the hub and hammer it into place with a hammer. If the bearing cannot be driven into the hub, or cannot fit tightly into the hub, do not apply force. Your hub may be slightly larger or smaller. If this happens, or the bearing is significantly too large or too small_x000D_ _x000D_ Disassembly:_x000D_ The bearings are fixed in the hub by an interference fit. To remove the bearing, lean a piece of wood against its side and hit the wood with a hammer. Place the wood on the opposite side and hit again. Continue this process until the bearing is removed from the hub. Do not dismount the bearing to attempt to remove it. Note: Please double check the part number of your item, matching information is for reference only._x000D_ If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks!