The side CD connector is used as the connecting element of the CD profiles for their T-joints at the same level when installing metal frames of suspended gypsum plasterboard ceilings. The connector is tightly attached to the CD profile with latching leafs, and then another metal frame profile is put on the one side in a T-shape.
It is used to mount frames, which save effective height of the room, but at the same time are sufficiently rigid and reliable.