Baby Stroller Connectors for YOYO Strollers 2-in-1 Dual | eBay
Amazon.com : Twin Stroller Connector for Baby Universal Fits Umbrella Strollers Babyzen YOYO Yoya Etc.. Turns Two Single Strollers into a Double Stroller : Baby
Babyzen YOYO+ Baby Car Seat Adapter | Pottery Barn Kids