The corrugations in these round elbows give the elbow more rigity as well as room for expansion. Each elbow is crimped to fit inside other elbows and downspouts. The female end easily fits over the half round "B" style outlet tube or into other round corrugated elbows and downspouts.
Elbows can be soldered, screwed, or riveted to adjoining elbows and downspouts. We carry Round Corrugated Elbows in 3", 4", 5" and 6" in a variety of colors and metals.