The product contains: 1 M18 x 1.5mm oxygen sensor adapter with filter. Compatible model: The oxygen sensor is a universal 18mm threaded socket that is suitable for most vehicles with an M18 x 1.5 oxygen sensor hole. Stable design: The oxygen sensor adapter is made of high-quality stainless steel, durable, not easy to rust, well sealed, waterproof, high temperature resistant, high strength and durable. Wide application: This lambda probe extension is necessary when using HHO systems or pipelines. It can also be used in the sanitary field of motor vehicles to reduce fuel consumption. Increase the distance between the lambda probe and the exhaust system. After-sales service: If you have any questions, please feel free to contact us! We offer 24-hour service, thank you for your patronage! Package Content: 1 x M18 x 1.5mm O2 Oxygen Sensor Extension. Compatible Model: Suitable for most modern vehicles and with thread for easy connection of upstream and downstream O2 sensors and car exhaust gas. Compatible with most car O2 sensors. Powerful Functions: Built-in micro filter and micro catalyst, effectively eliminate CEL and clear P0420 error codes. Special thread for perfect accuracy and repeatability. Easy to use: This oxygen sensor adapter is made of high quality stainless steel which can be used for a long time, easy to use and connect in minutes, making it a universal fit for all 18mm threaded sensors.