Thank you, WEBIKE! I didn't think I would ever find the right part. This exhaust joint gasket fits the Delta Barrel 4 Exhaust. I didn't have a caliper to measure the exact fit of the exhaust joint and they smash after use. So I didn't know the actual size I needed. It was proving quite difficult. My exhaust wouldn't fit without it. I now have it am I'm very pleased with the product. Thanks again, WEBIKE.