I have been running a Hypro D252 for almost 20 years now. Works great! I have seen almost 26 inches on the vacuum gauge. I have had diaphragms last 5 years but now i replace them at the beginning of the season so I don't have to worry about them. I disassemble the pump when I buy it, clean out the oil and run vegetable oil just to be safe. I will be adding one to a 300 tap sugar bush for the 2021 season.