Those see thru composite tanks are nice. I just wonder how much hassle one would get when trying to have one refilled. After many years of dealing with some of these folks that do the refilling I'm sure I would get the response that it must be steel in order for them to refill. A little costly but sure enough accurate way of checking your levels. I just wait for mine to run out now, then disconnect and have refilled. I do do one at a time, but still a hassle......
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