The Baby Jogger(R) City Prix Trailer Conversion Kit allows you to easily transform your City Prix Jogging Stroller into an aerodynamic bike trailer to tow your tot in a few simple steps. The kit includes a trailer hitch, coupler, and visibility flag. Features: Everything you need to transform your City Prix Jogging Stroller into a Bike Trailer Includes a trailer hitch, coupler, and visibility flag One-step hitch attachment Compatible with City Prix Jogging Stroller