Have 4 4x14 opening ports that need new gaskets. Spent 5 hrs today ( ya five) and got 1.5 ports done and a very high level of frustration. After all, how hard can a few gaskets be? Followed the instructions on Beckson website and even talked to them. This design ranks among the top three worst designs. The others are 1) don't know and 2) presta valves on bicycle wheels. If I complete the second port, then the hose test follows. I remember that an automotive windshield place told me yrs ago that glycerin would rejuvenate rubber which these gaskets are. They suggested it on the door seals of my MGB. Ended up selling the MG wishing I hadn't..any experience?