This is a 5ft extension for the Bosch LSU4.9 sensors, such as 17025. This sensor is used in MANY aftermarket wideband sensor/controllers. This is perfect if you need a little extra length in case your sensor is far away from the firewall access hole. This is a common issue with some applications that has the sensor a long way from the ECU and firewall access. 5ft length with fiberglass wire loom and rubber boot at both ends, as pictured. Made with NEW connectors, crimped pins, wire seals, and high quality automotive 18awg conductors.