Does this sibling seat come with the adapters necessary to make the system work?

Hi Naomi, thank you for your inquiry, the Thule sleek sibling seat does not need adapters when used with the Thule Sleek buggy, the buggy itself has pockets for the seat to click into. We hope this helps. 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.