Ive looked at them many times myself.I've wanted these for years, but couldn't bring myself to part with the money because I always found a solution albeit frustrating. Last weekend I was inconvenienced for the last time. They are really nice!
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All of the air driven hyd. press combinations I saw when I wanted to upgrade were only drive up to 10 tons. that may be the reason it's mounted on the12 ton bottle.