Replacing stripped or damaged 02 sensor ports? Adding an 02 sensor bung to a newly fabricated exhaust? This weld-on 45 degree 02 sensor bung is what you need! The 45 degree cut gives you the versatility and ease of installing sensors in a tight spot that may require an angle. The cut is also notched which gives you the ease of welding it on a round surface. Made from 304 stainless steel, using the popular size of 18mm x 1.5mm thread. This bung will accept most standard 02 sensors from most manufacturers.