Our 4″ smooth round elbow is 16 oz.
The average installation requires two elbows at the top and one at the bottom. If you are connecting your downspout into a drain tile, the elbow at the bottom is not necessary.
To determine the overhang, measure the distance between the wall of your building and the back of the outlet. An overhang of 8″ will require 2- 72 degree elbows. If your overhang is greater than 8″ you will need to insert a piece of downspout between the elbows.
An overhang of less than 8″ will require 2- 40 degree elbows. This elbow combination also works when making a transition around a ledge or other protrusions.
40, 72 and 90 degree elbows available.
Also, available in the following material – call for information: