This adapter allows the carrier to increase the original load capacity of your Aguri Active 2 or 3 bike carrier by one. So if you are going for the Aguri Active 2 that can increase to 3. If you are going for the Aguri Active 3 it will increase it to a 4 bike carrier.
Ideal to have if you want to increase on special or rare occasions.
The kit includes a mounting rail for the wheels to sit on and a clamping arm which holds the bike frame securely to the last mounted bike.