When someone refers to themselves as having slip-on flanges, what exactly does this term mean?Slip-On flanges, also known as SO flanges, reducers, long-tangent elbows, and swags, are constructed to slide over the exterior of the pipe. Other names for these flanges include: reducers, swags, and long-tangent elbows. Reducers, swags, and long-tangent elbows are some of the other names that are...