Fits: 2001-2004.5 Chevrolet Silverado 2500HD/3500HD 6.6L Duramax LB7 2001-2004.5 GMC Sierra 2500HD/3500HD 6.6L Duramax LB7 Eliminate low fuel rail pressure diagnostic trouble codes in your 2001-2004 GM 6.6L Duramax LB7 with the BWD Duramax LB7 Fuel Rail Plug. This plug is ruggedly constructed and eliminates the possibility of fuel returning to the fuel tank. The result is consistent fuel rail pressure so you have the fuel you need to support sharp acceleration, aftermarket tuning, and other performance upgrades. Each plug is ready to install and CNC machined from 304 stainless steel. FEATURES: – FUEL RAIL PLUG – MACHINED FROM 304 STAINLESS STEEL – ELIMINATES LOW FUEL PRESSURE DTCs P1093 & P0087 (LOW FUEL RAIL PRESSURE DURING POWER ENRICHMENT) CAUSED BY INSUFFICIENT PRESSURE IN THE PRESSURE RELIEF VALVE (PRV) SPRING. THIS CAUSES THE VALVE TO OPEN TOO EARLY, RESULTING IN EXCESS FUEL RETURNING TO THE TANK.