So I have been using my UFS attachment for a couple of years without any issues and it started leaking. I took it apart and realized it was missing a 2mm/1mm o ring. I ordered some o rings and got it put together correctly. It has the 4mm/1.5mm on the bottom and the two 2mm/1mm o rings on the inside and it seemed like it was working fine. I came back to it a hour later and all the juice had leaked out of the tank. I have no idea what is going on. I am thinking maybe an issue with the top o ring by the mouthpiece putting too much pressure on the atty and it is making the atty loose but when I take it apart the atty is still on there tight and looks flush so I have no idea how it is leaking. Do I even need the top o ring since I have the stainless steel tip screwed on there and not a regular drip tip. Any input would help. Thanks.