This car seat adapter will allow you to attach the following car seats to your duet double stroller (including pre 2014, 2014+ and 2017+.)
Mountain Buggy protect
phil&teds alpha
Maxi-Cosi Cabriofix, Maxi Cosi AP, Maxicosi Pebble
Cybex Aton
Nuna Pipa
Please note: This adapter is intended to be used to convert your duet into a travel system holding only one car seat, it comes with an alternate sun hood for use on the left-hand side seat of the buggy whilst the car seat sits on the right.