I bought four of these for two, 5 gallon Diesel containers, one, 5 Gallon gasoline container and a two gallon gas/oil fuel container. They work very well to increase fuel flow allowing much faster fill times. Installation is very easy and very quick. The metal cap covers are not the same size as automobile valve stem caps but I do not find that to be a problem as long as none of the four get misplaced. I would buy again.
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