20mm water pipe 90 degree collar

A simple collar that allows movement of the 20mm water pipe (if needed). Sunken screw holes (#4 - 9mm) if one or both pipes are to be fixed. This is light-weight model, less material, less strength.

Used in the corelines A2 lightbox.
(http://www.instructables.com/id/A2-overhead-corner-LEDs-lightbox/)