Silly Ram put a coolant cap that requires a screwdriver or something stuck in a slot to lock the cap to remove and replace it if you need to add coolant.  Unfortunately my new truck had a factory fresh leak in the intercooler coolant system, and I needed to add an ounce or two a week until I could get it in have them fix it under warranty.  So created this little cap so I did not have to run down a screwdriver each time.  

The pin was made separate from the cap since layering the wrong direction would make the pin weak.  Just clean it up and slip the pin in the cap.  The pin will slide into the slot on the cap, then it works like a regular cap.