Notched-style mounting bungs are made of high-quality 304 stainless steel with excellent weldability, ideal for installing O2 sensor bungs easily. The matching plugs adopt a natural stainless steel finish, offering stable corrosion resistance and long service life. Designed with standard M18×1.5 threads, this O2 sensor bung fits most common models for wide applicability. Both welded bungs and threaded plugs have great welding performance, cost-effective and highly practical. Featuring a flexible structure, it can be installed at any position as needed, perfect for O2 sensor mounting, custom pipe processing, manifolds and various pipe fitting applications.