Made from high-quality stainless steel, this bung adapter screws into an 18mm bung for use with some 12mm narrow-band O2 sensors. Outside thread is M18x1.5 and the inside thread is M12x1.25.
- Go from 18mm to 12mm bung size
- Outside Thread: M18 x 1.5
- Inside Thread: M12 x 1.25
