Ready to roll from car to stroller! Convert your duet (pre-2015) stroller into a travel system. Attach your car seats onto the frame using this adapter. This car seat adapter will allow you to attach TWO of the following car seat to your duet double stroller: Mountain Buggy protect, phil&teds alpha, Maxi Cosi Cabriofix, Maxi Cosi Mico, Maxi Cosi Pebble, Cybex Aton. This adapter must be used with two car seats at a time. To convert your duet into a travel system with only one car seat, please use clip 28.