This is a replacement 1.98 Size Kodiak XL Pro Lube Housing for standard 3,500lb 5 Lug Trailer Hubs. With an anodized Aluminum Housing and a Blue Polycarbonate Oil Cap, Kodiak has designed this system to utilize components that will both battle corrosion and excel at high temperatures. When installing this Housing to your trailer hub, for an ideal and long lasting connection, use a sealant on the surface of the housing before installation on the Hub. This Kodiak XL Pro Lube Cap is also available in this category as a total kit for a complete axle assembly.