a 22mm oring? what is that for? I was trying to see it in the pic, the orings are supposed to slip in the channel or the caps can get stuck, glass is non porous unlike metal or plastic, which means the orings do not get lubrication until taken apart again. which can weld orings to glass. This is why we allow oring movement in the cap channel to roll off and on when disassembling and reassembling. Never lube the outer orings unless with water or clean alcohols. and most important never force the caps on the Tank, they should be pressed and slightly turned to allow the seating of the oring in the glass channel. When assembling make sure to press the oring in the cap channel as it does have movement, and important is to clean the orings and the caps well often. Let me know if your having issues.