Flex fuel sensor, ethanol content sensor for your flex fuel converted vehicle. Works with all major ECU on the market. The flex fuel sensor is used by the engine control module to adjust the air/fuel mixture and ignition timing for efficient operation. This is a genuine GM / Continental ethanol content sensor, in a newer smaller version without integrated mounting points. Nuke Performance Full Flow Flex Fuel Sensor Adapter AN-10 with oversized bypass functionality Used together with Nuke Performance Full Flow Flex Fuel Sensor Adapter, that lets you run the sensor on both the pressure and return line of your fuel system with close to no flow loss. The bypass function of the Full Flow Sensor Adapter is exceeding the inlet and outlet size of AN10 which maximizes flow at the same time as you get an accurate reading out of the sensor. For the 13577429 sensors, the sensor adapter also works as a bracket, letting you mount the sensor in a safe and effective way. Manufacturer part number # : 13577429Dimensions : 76 x 95 x 30mm (3.0 x 3.7 x 1.2 inches)Inlet / Outlet : SAE 9.49 (3/8") If you wish to change or complement the use of fittings of the highest quality, we recommend that you use our fittings which are designed to withstand high power and excessive wear and in the right combination with the products they were intended for.