Hello, recently I tested my seal for the end-caps with a hand vacuum pump. At first it seemed to be airtight, however after a minute or so I could tell that the dial had moved down very slightly and continued to fall very slowly. I want to emphasize that it was a very slow decrease but was noticeable after a few seconds of staring at the dial. I wanted to know if this loss of negative pressure equates to a leak or if it will still be watertight since the pressure loss was extremely gradual and slow. Also I want to add that my seal is similar to previous times when no water leaked in.