Weld-In O2 Sensor Bungs When you’re fabricating or upgrading an exhaust, clean O2 sensor placement is everything. These Drag Specialties 12m and 18mm weld-in O2 bungs give builders and tuners a solid, precision-machined mounting point for wideband or factory-style sensors. Whether you're dialing in a performance bagger, chopping a Softail, or building a one-off exhaust for an M8 or Twin Cam, these bungs keep your AFR readings accurate and your welds clean. Made from quality steel and ready for anything you can throw at them. Features Straight-style weld-in bungs for custom exhaust fabrication Designed for 12 or 18 mm x 1.5 mm thread O2 sensors (wideband or OEM) Ideal for tuning, dyno setup, or relocating factory sensors Durable steel construction for strong weld joints Machined for proper sensor engagement and leak-free performance Made in the USA Fitment Universal — fits any custom or fabricated exhaust system requiring 12 or 18 mm O2 sensor ports. Includes Two steel weld-in O2 bungs
