Is this compatible to attach to a mountain buggy swift?

Hi Victoria, thank you for your enquiry, you may be able to use this capsule with the mountain buggy, however, we would recommend contacting your nearest Mountain Buggy retail store in regards to adapters that maybe suitable. We hope this helps. ?For further information on this or any of our other products available, if you follow the link https://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.