This is the ShoreStation Dock Side Connector DA-0068-00 and is used with all leg frames 36" or less. This connector is also used on docks with wood or plastic sideboards. The connector attaches to the ears on the leg frames of two adjacent dock sections to securely lock them together to form a platform. One leg extension with pad has to be removed so that the two leg frames can be joined side-by-side without leg interference. One DA0068 dock side connector is required for every staggered leg frame being attached to another existing leg frame.