When I first received my hit-air vest, i connected it as described in the instructions. The cord, once disconnected from the bike, hangs down along the bike about a foot or two and promptly landed right on the exhaust of my bike and melted. It has to be on the right-hand side due to the vest design. Quite annoyed, I called BikeBone and they explained that I should also use this product. I didn't understand at first how this would solve the problem.
Reuben explained to me that this piece, the female end which is the same as that on the vest, gets permanently attached to the upper part of the bike somewhere. When you disconnect the vest from the male end on the chord (which is also affixed to the motorcycle), you connect that male end of the cord to this, thus keeping it up and away from the hot engine/exhaust components.
Reuben resolved the problem immediately and replaced both components. What excellent customer service! Would absolutely recommend both the Hit-Air vest and BikeBone!