I bought this box for my camper to house my propane tank and battery. It is high quality and all sizes fit me. Unfortunately the actual cap opening size was not given. A 20 lb propane tank will not fit through the opening. The hinge strip reduces the size of the cap opening so always keep that in mind if you plan on using this. The cap opening is actually 11" and the propane tank is 12 inches in size. I reluctantly had to return it for a refund, which was very easy. After the thought of putting the propane tank and battery together in a closed box it was probably unsafe anyway.
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