This part allows you to remove the factory regulator on 99-03 truck fuel rails so you can use an aftermarket regulator with your stock fuel rail. Comes with a new oring, and the end can be drilled and tapped for a fuel pressure sensor if you like. Made from billet 6061 aluminum and mounts like the factory regulator using the stock hold-down clip. Does not work with the flex fuel rail as that rail uses a larger FPR than the standard one.
If you use this part on a high performance build you may want to enlarge the opening in the fuel rail slightly for better flow.