Babyzen YoYo² Twin Setup with Connectors (Side by Side) - TinyExplorers
Amazon.com : Twin Stroller Connectors, Transform Two Single Strollers into a Working Twin Stroller, Fits Most Strollers : Baby
YOYO Connect: The Ultimate Double Stroller – Mamas & Papas UK
Zhaomeidaxi Twin Stroller Connector for Baby Umbrella Strollers Turns Two Single Strollers into a Double Stroller Baby Car Linker for Outdoor - Walmart.com
YOYO Connect: Get your first look at Babyzen's first double stroller!