ISR Fuel Rail Adapter - Nissan SR20DET If you are looking to install an aftermarket Fuel Pressure Regulator to your RWD SR20DET, the ISR Performance Fuel Rail Adapter allows you to remove your 2 bolt factory regulator and replace it. The ISR Rail Adapter utilizes the same 2 bolt flange as your OEM regulator, and adapts the outlet to a standard hose barb style from which you can clamp standard injection hose onto.   ** All ISR Performance Products are Designed for Off Road Use Only **