RamSeal

The RamSeal is to close the gap between the tailgate and the bedrail caps on Generation 5 Ram's with the RamBox.  
 
The pair of RamSeals will keep your Ram's bed clean and dry.
 
It uses 3M automotive tape to attach to the back of the bedrail cap to stay in place in all conditions and it has a piece of weatherstrip on the opposite side to seal against the tailgate when closed.