I've got two 444cuft 4500 cylinders. One in my garage and one in my back yard storage shed. I just got the second one in the last month but the first one would last over a year in conjunction with a couple of other SCBA's mixed in. I could see where a booster would really benefit me. There could be a lot of usable air left in the cylinder under 3100-3000psi and then multiply that by two. It's not costing me anything to get refills but it is a little hassle loading these monsters...I'll keep a booster in mind for sure.
jimmy
jimmy
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