This Billet Fuel Pump Block Off Plate is used to cover the hole in the block when you are using an aftermarket lift pump, such as a Fass, for your 12 Valve or 24 Valve Cummins. This plate can also be used on 2003-2018 Cummins engines to block off the crankcase vent return port on the driver side of the block when using an aftermarket valve cover. Etched with the II logo from Industrial Injection.