Air venturi tanks

As for how many fills it depends on the size tank you buy. Use the calculator hawkeye put a link in for. As far as the tanks they work great. I have 2. The small 13 cf tank for taking out in the field and a 98 cf tank for the bench. The only thing i wish the big tank had was a foster fitting so i could fill it directly from my AV compressor without the adapter. And second i wish it told you how much air was left in the tank without using the plug. But its not a big deal. Im very happy so far.