Ticon Industries &ndash; Titanium M18x1.5 O2 Sensor Bung 2.75&rdquo; to 5&rdquo; Tubing (qty 1) &ndash; 104-00100-5000 Titanium O2 Oxygen Sensor Bung Fits 2.75 Inch to 4 Inch Tubing package includes ONE O2 Bung Coped end for gapless fitment against tubing M18x1.5 Thread Pitch works with most standard OEM oxygen sensors Precision CNC machined from High Grade Commercially Pure Grade 2 CP2 Titanium