[Good Quality]: This oxygen sensor adapter is made of high-quality stainless steel, which is strong and durable, resistant to rust, ensures good sealing, is waterproof, and high temperature resistant. The thread is precision-ground using specialized tools for high accuracy and consistent performance. [Easy Installation]: Simple and user-friendly operation. Align the spiral pattern interface with the installation point for secure fitting. [Special Design]: Features a built-in filtration system with catalyst material, designed to assist in addressing CEL warnings and error code P0420. Thread manufactured with precision tooling for reliable fit and repeatability. [Practical Function]: This lambda probe extender is useful when using HHO systems or testing equipment. It can be used in exhaust systems to adjust sensor positioning, increasing the distance between the lambda sensor and the exhaust flow. [Wide Range of Applications]: Universal 18mm threaded adapter that fits most vehicles with M18 x 1.5 oxygen sensor ports. Compatible with upstream and downstream O2 sensors and commonly used in automotive exhaust systems. Easily installs into standard O2 sensor bungs.