Review on 🏍️ Innovate Motorsports 3835: Motorcycle O2 Bung Adapter, 12mm to 18mm Conversion - Enhance Your Bike's Performance! by Antonio Liu

This item is clearly described as a 12mm to 18mm adapter but the one I received has a 1/2-20NF thread. The nut screws into either a 12mm 1.25 or 1/2-20NF thread, but the adapter is large enough not to cut into the exhaust manifold. Also, it appears to be a quality product, there is simply no quality control by the shipping department.