1. High-Quality Stainless Steel: Made from durable stainless steel, this oxygen sensor nut weld bung plug is built to last. It offers excellent corrosion resistance, ensuring long-term reliability and performance. 2. Compatible Thread Size: Our O2 sensor adapter features an x 1.5 thread size, which is suitable for most standard O2 sensors. It provides a seamless fit and secure connection, allowing for accurate readings and optimal sensor performance. 3. Easy-to-Weld Design: The oxygen mounting bung plug is designed with an -1.5 threaded processing and a stepped recess, making it easier to achieve a flush surface weld. It allows you to add an O2 sensor wherever you need one, Perfect for custom exhaust systems, manifolds, downpipes, and more. 4. Versatile Application: These O2 sensor fittings weld bungs are perfect for welding into aftermarket exhaust systems, providing a designated location for installing oxygen sensors. Simply drill a hole and weld them in place. If using a plug, be sure to apply some anti-seize compound on the plug threads. 5. Replacement or Upgrade Option: These low-carbon steel nut bungs are also great for replacing or loose factory plugs. They offer a reliable solution for adding or upgrading oxygen sensors in your exhaust system, ensuring accurate readings and improved engine performance. Designed to add an oxygen sensor anywhere you need it. Perfect for installing custom exhaust pipes, headers, downpipes, etc. Type: Flat-port Colour:silver Material:Stainless steel Package Contents: 1 x Oxygen sensor nut plug Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.