When it's time to put the rain barrel away for the winter season, empty the rain barrel, remove the screws and Flexi-Fit Diverter and cover the hole in the downspout with this winter cover plate.
 

Tip/Helpful Hint: Did you lose the winter cover over the past summer?

Take a piece of fishing nylon and thread it through the screw hole. Loop the other end through the Flexi-Fit diverter screw hole. Now they will both be tied together and always hanging on the downspout pipe.

Location:

The Winter Cover at position #7 in the drawing below and
when installed it is at position #6.