I love my standard 3-burner Bunn commercial coffee maker. I have lots of standard spherical glass 12 cup carafes (not thermal) like commonly used in restaurants. I'd like to find some sort of cap or cover for the carafes, but I don't see anything in a web search. I want a cap to 1) help keep the coffee warm and 2) keep bugs and leaves out (I use it outdoors a lot). The opening at the top of the carafe is 2" in diameter, so I could use a cork the same size, which would work fine. But I wonder if there is something else available. I don't need to pour thru the cap. any ideas?