O2 Sensor Adaptor (18mm - 12mm)

Sold as singles or choose quantity 2 for twin cylinders.

Use these O2 adapters to convert your 18 x 1.5mm O2 bungs to 12 x 1.25mm. Typically you would use these in a situation where you have converted your header to work with 18mm wide band O2's (Auto Tune) and are switching the Auto Tune to a new bike and want to return the old bike to the stock 12mm narrow band O2's.