41mm CEL O2 Oxygen Sensor Spacer Catalytic Converter Fix Check Engine Light Specification: Material: Brass Placement on Vehicle: Rear Thread: M18 X 1.5 Weight: 136g Length:41mm Color: Brass Features: 1. Polished front surfaces enabling perfect tightening 2. Washer in the set - ability to adjust the angle of screwing in the extender 3. Threads made with dedicated tool - perfect accuracy and repetability Exhaust gas inlet hole 4 mm. 4. In extreme situations narrowing of the inlet hole prevents motor failure (driving at high speed) . 5. Professional quality of manufacturing. 6. Threads are made by special tools and are very accurate, suitable for repeated use. 7. Fitments (For the reference): For decat hydrogen M18x1.5 Package Include: 1X 90 Oxygen Sensor Adapter Note: 1. Please allow 0.1-0.5cm difference due to manual measurement. 2. Please check carefully to make sure whether the item matches to your vehicle or not. 3. The color of the actual items may slightly different from the listing images due to different computer screen, thanks for your understanding. Return Policy All of our items come with a 30-day free return policy. If you need to return, please contact us, let us know the detailed problem and send us some pictures for confirmation. We reserve the right to refuse any returns for objective reasons. Shipping Policy All of our items are shipped free with tracking numbers. Orders will be shipped within 3 working days upon receipt of payment. Most orders will be shipped within 1 working day. In most cases, shipping takes 8-12 working days.