PEG City Loop Duo AdapterThe Duo Adapter For City Loop allows you to join two City Loop chassis, transforming them into a double or twin transport system. With the Duo Adapter for City Loop, managing siblings and twins couldnt be easier as it transforms City Loop from a single to a double stroller, and vice versa. With the adapter you can create different configurations to transport either 2 siblings close in age or 2 twins.