Does this capsule fit into mountain buggy duet, will it need an adapter, if so what kind

Hi Natalie, thank you for your enquiry, The Maxi-Cosi Mico AP is compatible with The Mountain Buggy Duet with the correct adapters which can be purchased at your local Mountain Buggy Store. We hope this helps. ?For further information on this or any of our other products available, if you follow the link http://www.babyonthemove.co.nz/store-locations/ this will take you to our online store finder. Here you can find contact details for your nearest Baby On The Move Store where one of our team experts will be happy to assist you in your product search and help answer any further questions you may have. We hope this has helped with your query.