[Good Quality]: This oxygen sensor adapter is made of high-quality stainless steel, which is strong and durable, resistant to rust, ensures reliable sealing, and is waterproof and high temperature resistant for long-term use. 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 a mini catalyst to assist in reducing CEL indicators and addressing error code P0420. Thread is machined with precision tooling for optimal fit and repeatability. [Practical Function]: This lambda probe extender is suitable for use with HHO systems or testing setups. It can be used in exhaust systems to adjust sensor positioning and increase the distance between the lambda sensor and the exhaust system. [Wide Range of Applications]: Universal 18mm threaded adapter designed to fit most vehicles with M18 x 1.5 oxygen sensor ports. Compatible with most modern vehicles and easily installs into upstream and downstream O2 sensors and exhaust pipes, fitting standard O2 sensor threaded ports.