Baby Stroller Connectors for YOYO Strollers 2-in-1 Dual | eBay
Car Seat Adapter for Baby Strollers | BABYZEN™ YOYO²
BABYZEN YOYO connect - Single to Double Stoller Connector | Baby Earth
Amazon.com : Twin Stroller Connector for Baby Universal Fits Umbrella Strollers Babyzen YOYO Yoya Etc.. Turns Two Single Strollers into a Double Stroller : Baby