[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 of the spare parts. [Special Design]: Features a built-in filtration system with catalyst material, designed to assist in addressing check engine light (CEL) issues and error code P0420. Thread manufactured with precision tooling for accurate fitment and repeatability. [Practical Function]: This lambda probe spacer is suitable for use with HHO systems or testing setups. It can be used in exhaust systems to adjust sensor positioning, helping to increase the distance between the lambda sensor and the exhaust flow. [Wide Range of Applications]: Universal 18mm threaded adapter fits most vehicles with M18 x 1.5 oxygen sensor ports. Compatible with a wide range of modern vehicles, easily installs into upstream and downstream O2 sensor locations and exhaust pipes, and works with most O2 sensor threaded fittings.