This CNC machined plate is designed to block off the opening into the engine block on most British engines formerly equipped with a mechanical fuel pump. It slips onto the studs that once held the pump. Incorporated into the plate is a NPT port plugged with a brass pipe plug. This plug can be removed and the port used for a return line into the crankcase should an air/oil separator be added. When installing the plate, the port and brass plug should be on the lower half of the plate. Included with the plate is a gasket and brass plug.