This elbow now comes standard with the Dust Deputy Deluxe by Oneida.
Older models did not feature this right angle elbow on the top of the cyclone. This is now offered as an optional part for those who would like to "upgrade" their unit to the new style. This is useful when the cyclone unit is in a cramped space, such as under your workbench.
One straight 52mm I/D end to mount on the cyclone itself, the other end is tapered from 48mm O/D to 54mm to suit various hose attachments.