A downcomer shaped as a channel is attached to a four-sided stud welded to a supporting surface. The central web of the downcomer engages one side of the stud and its side flanges are spaced from two additional sides of the stud. A U-shaped member overlies the remaining side of the stud, with side flanges of the U-shaped member positioned in the spaces between the side flanges of the downcomer and the adjacent sides of the stud. Fasteners hold the assembly together.
