O2 2-PIECE 18MM to 12MM ADAPTER, PLUG O2ADAPTER18-12 Source: https://voodoomoto.com/products/o2-2-piece-adapter-plug Retrieved: 2026-11-07 Manufacturer product notes, not a complete installation manual. Follow the instructions supplied with your exact part; contact TPC for missing instructions. DESCRIPTION 18mm To 12mm O2 Sensor Bung Adapter Stainless Steel With Block Off Manufacturer fitment selector: Videos: Manufacturer video references (verify your exact part):