2x Stainless Reduce O2 Sensor Port Bungs Plug Adapters 18mm-12mm for Harley
2 Pieces Bungs. O2 mounting bung was made of stainless steel. Threaded outer and inner adapters reduce O2 sensor port from 18MM to 12MM allowing riders our exhaust on select newer-model. We'd like to settle any problem in a friendly manner.