K-Tuned 10AN High Pressure Fuel Pressure Regulator (FPR) 8ORB Return KTD-FPR-10B Our high pressure FPR is designed for higher horse power applications. The 10ORB feed and 8ORB return allow easier setup for larger fuel lines. The larger top hat allows us to use a larger stiffer spring to increase pressure and allow a more accurate adjustment. Comes with an adjustable bracket to easily mount it anywhere. A high quality E85 safe diaphragm is used internally, which is the most important piece.