[Good Quality]: This oxygen sensor adapter is made of high-quality stainless steel, which is strong and durable, resistant to rust, ensures reliable sealing, waterproof, and high temperature resistant for long-lasting performance. The thread is precision-ground using specialized tools for high accuracy and consistent repeatability. [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 mini filtration network with a mini catalyst, designed to assist in clearing the CEL and addressing error code P0420. Thread manufactured with precision tooling for accurate fitment and repeatable results. [Practical Function]: This lambda probe extender is suitable for use with HHO systems or testing applications. It can be used in exhaust systems to adjust sensor positioning and increase the distance between the lambda sensor and the exhaust system, potentially supporting improved fuel efficiency. [Wide Range of Applications]: Universal 18mm threaded adapter compatible with most vehicles featuring M18 x 1.5 oxygen sensor ports. Fits both upstream and downstream O2 sensors and easily installs into most standard O2 sensor threaded locations on car exhaust systems.