Fuel Pressure Regulator Conversion KIT RA-series Black Radium Engineering - USA-RAD-20-1101-00 - OVERVIEW This kit permits all previous Radium Engineering adjustable fuel pressure regulators to be converted to an RA-Series FPR. This will add all of the newest features as well as performance enhancements to older regulators.  FUEL PRESSURE ADJUSTMENTRA-series regulators feature the first tool-less pressure adjustment. A jam nut and set screw are no longer required. With a simple turn of the knob, pressure will be increased or decreased. To aid in adjusting pressure, there are incremental detents that provide haptic feedback to the user. Every detent permits 1psi (+/-0.5psi) of adjustment depending on current fuel pressure. FUEL PRESSURE STABILITY With years of track and bench testing data, the RA-series regulators have been refined to optimize pressure management. A newly designed single stainless steel return orifice generates laminar flow that enhances stability control. Minimum Pressure: 18.5psi (1.3bar)Maximum Pressure: *N/A*This is rhetorical. The maximum pressure is dependent on the relief valve inside the pump or the maximum current the fuel pump controller allows.  FUEL COMPATIBILITY This RA-series conversion kit is suitable with all gasoline types including unleaded, leaded, oxygenated, and pre-mixes. Furthermore, they are compatible with alcohol blends of fuel including methanol, ethanol, and E85.  INCLUDED-Upper Rotating Assembly-5mm Barbed Vacuum Fitting-Vacuum Plug Fitting (Returnless)-1/4" Push-To-Connect Vacuum Fitting-3AN Male Vacuum Fitting-Anodized Half Moon Retainers (x 2)-Stainless Steel Return Orifice-Stainless Button Head Screws (x 5)-Stainless Steel Spring-Fluorosilicone Diaphragm Instruction PDF