The Adapter for the Duette Piroet creates even more compatiblity options for parents. With this adapter, two Bassinet Pop-Ups can fit on the Duette chassis at the same time. This allows twins to travel in complete comfort (and style). The Duette Adapter also allows for a Bassinet Pop-Up and Primo Viaggio car seat to fit on the chassis together. The adapter is easy to attach and remove.