Replaces part number:12639277,12639450, 97384931.12642623.TP3018.12664429 Function:Let the Engine Control Unit(ECU) and/or dashboard lamp indicator know when water detection has occurred in the vehicle's fuel supply. Manufactured specification for fit, form, and function 1.PREMIUM QUALITY - Top quality Duramax Water in Fuel Sensor, also known as WiF sensor, usually built in the fuel filter, indicates the presence of water in the fuel. This Duramax Water Fuel Sensor helps you detect water in fuel and send you a warning; 2.FIT THE FOLLOWING VEHICLE - Duramax Water fuel sensor fit for 2001-2011 Chevy 6.6L Duramax LB7 LBZ LML LGH LMM engine, including 2001-2011 Chevy Silverado 2500 HD, 2007 Chevy Silverado 2500 HD Classic, 2001-2006 Chevy Silverado 3500, 2007 Chevy Silverado 3500 Classic, 2007-2011 Chevy Silverado 3500 HD, 2001-2011 2500 HD, 2007 2500 HD Classic, 2001-2006 3500, 2007 3500 Classic, 2007-2011 3500 HD; 3.REPLACE PART - Replace 12639277 12639450 97384931, commonly found on 01 02 03 04 05 06 07 08 09 10 11 Chevy Silverado 6.6 Duramax LB7 LBZ LML LGH LMM Engine; 4.DIRECT FIT - Direct replacement for a proper fit and easy installation, quality materials used, meets or exceeds standards. Material:Metal + plastic colour:Black + white Package Contents: 1 * Water in Fuel Indicator Sensor Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.