This is one of our coolest products.  How many times have you run out of propane on a long trip?  Didn't top off your tanks because you thought you were full?  Wouldn't it be cool if you could simply look and see how much propane you have?  These D.O.T. certified fiberglass tanks are translucent enough for you to actually see the propane level.  To make things even better, once the tank is empty it's a third lighter than a standard steel tank!  Lugging them out of that internal compartment on your 5th-wheel just got easier.  Also, they won't ever rust.  Cool.