When you purchase an Instep or Schwinn bicycle trailer (both brands from the same manufacturer, Pacific Cycle), your trailer comes with one coupler piece included. Installation may take 5-10 minutes, but once installed it only takes seconds to attach trailer to a bike every time you plan to go for a ride. * However, if you want to switch bikes, you will have to uninstall the coupler from the first bike and install it on the second bike, which may take 10-15 minutes for the switch, making this very inconvenient on a regular basis. * The coupler pieces are the original Instep / Schwinn coupler, brand new and come with one year warranty from the manufacturer, Pacific Cycle.