Stainless Bros SS304 M12x1.25mm weld bungs are perfect for adding a bung on your custom fabricated Stainless Steel exhaust system. The Stainless Bros bungs are CNC machined out of the high quality 304 Stainless Steel and come pre-coped specifically to fit 1.5" to 2.5" tubing for ease of use. *This product is designed for monitoring purposes only whereby the user can add additional monitoring equipment and not as an OEM replacement part. Ticon Industries Inc and Stainless Bros assumes no responsibility if the product is not used for its intended purpose*