M18 x 1.5mm REDUCER M12 x 1.25O2 OXY SENSOR BUSH STEEL ZINC

Aeroflow Performance oxygen sensor reducer bush is designed to step down an oxygen sensor. It features an M18 x 1.5mm on the outside and a M12 x 1.25mm on the inside. This allows a user to run a new style smaller oxygen sensor which features a M12 x 1.25mm thread pitch to the more common M18 oxygen sensor.