Hi - am replacing old galvanized tank and ran across your site. Like the looks of your Challenger tanks and would rather do business w/ non-big-box store! (Being an independant retailer myself.) Question: is the PC-111 the same class as the WellSaver 86 from Lowes? The drawdown specs seem to be wildly different for a tank that seems the same - Lowes is publishing "Max Drawdown" of 31.8 gallons while the PC-111 says "Total Drawdown" is 12.9 - 9.4 gallon dep on pressure switch settings. Is their max = to total tank volume?