Honda Accord Prelude Upgrade Motor Bolt-on Fuel Pressure Regulator Kit Black Fitment: Acura and Honda Applications, Thread Pitch Size: 9/16 - 9/18. 1:1 Ratio Adjustable Fuel Pressure Regulator Adjustable Fuel Pressure Regulator With 1:1 Ratio Adjustable From A Range Of 30 PSI To The Maximum Fuel Pump Capacity Outlet Port Allows Various Different Hoses Ranging From Stock Acura / Honda Fuel Return Hose To -8 AN Hose * Some Model Acura / Honda May Require Different Adapters, Please Check Your Vehicles Application For Correct Fitment *