OEM Aprilia Inlet Valve/Fuel Rail with Injector and Fuel Pressure Regulator – 841308 (ex AP8276009) For’04-’14 SR50 (all variants). OEM Aprilia Inlet Valve – 841308 (ex AP8276009). For’04-’14 SR50 (all variants). This fuel rail assembly is the only way to get a fuel pressure regulator or fuel injector for your SR50. Aprilia does not sell the separately from this inlet valve assembly.