This could be that I just didn't get the pressure gage installed properly but after using it several times there are little hair line cracks forming in the glass lid. The main point that got me when I received it was that there were no instructions on how to put everything together or any "key points of operations" instructions. You are kind of just winging it once you have it in your hands. I am happy with the operation but do wish that there was some kind of instructions for the inexperienced person such as myself.