The SeaSucker DoubleTap is two of the SeaSucker Vacuum Cups bolted together. So, the thought is you would attach one side to the object that you don't want to move, and the other to the object you don't want the same object to be moved from. For example, you have a cooler in the back of your truck that does not stay where you want it to. Attach one side to the cooler, and the other to the inside of your truck bed. This means your problem is solved! Don't tap out on the SeaSucker DoubleTap Vacuum Cups!