The fail safe on this pot prevents it from getting enough pressure built up to work properly.  I was using a pressure cooker at age 14......I'm now over 50.  When I put this pot to use, steam came out of the rubber safety vent and it never built up enough pressure to jiggle the regulator.  After cooking, I pulled it apart- there are ridges in the rubber plug- no wonder it did not work.  That is a dumb design!  I know you are a dying to make it safe; but, in doing so, you have rendered it useless as a pressure cooker!  Now I understand why Persto makes a glass lid for this pot- so when unsuspecting people, like myself, purchase their product and it does not work, they will still use it.  I won't, though, because my pots are of better quality.  My advice is to spring for the much more expensive All American brand and don't waste your time or money on this Presto Pressure Cooker.