propane cylinder cap

Having a spare propane tank isn't helpful when it's also empty. The brightly colored cap lives on the tank in use so it's mindless to put it on when empty. Trade caps when full and reduce the chance of running out. Kahnbahn FTW. #IBNU

Remixed propane tank cap with labels to indicate when to buy more and avoid running out.
Sliced to have complete first thread.