[Good Quality]: This oxygen sensor adapter is made of high-quality stainless steel, strong and durable, resistant to rust, ensures good sealing, 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 mini filtration network with a mini catalyst, designed to assist in clearing the CEL and addressing error code P0420. Thread is machined with precision tooling for optimal fit and repeatability. [Practical Function]: This lambda probe ext is useful when using HHO systems or test setups. It can be installed in exhaust systems to increase the distance between the lambda sensor and the exhaust, potentially supporting improved fuel efficiency. [Wide Range of Applications]: This oxygen sensor adapter has a universal 18mm thread, compatible with most vehicles that have M18 x 1.5 oxygen sensor ports. It fits most vehicles and can be easily installed on upstream and downstream O2 sensors and exhaust pipes, compatible with standard O2 sensor threaded ports.