This 2 5/16” ball coupler is manufactured by Titan. It has a heavy duty 21,000# towing capacity. The coupler is zinc plated to help prevent rust. It will fit on a 3” wide trailer tongue. This coupler is typically used on boat trailers that have either 2 or 3 7,000# capacity axles and do not have brakes, or are running an electric over hydraulic unit instead of surge brakes. It is very easy to install, it uses the same exact bolt pattern as the Titan model 6 hydraulic surge coupler.