It's wacky...they only leak when filled to the 3ml mark then drain halfway and then they stop leaking.
I tried to make a tight seal and it leaked even worst.
Plus from tightening it to try to get a seal my other tanks wouldn't make contact with vamo anymore and had to adjust the screws on them to work again.
I don't think the vamo V2 has a floating pin head so I got worried it was damaged ,but thankfully adjusting my screw on bottom of my other tanks worked. Never had to adjust them before until this crappy iclear 30 messed my vamo head up.
Also..I don't see an adjusting screw on the botton of the iclear 30's like i have on other tanks.
I been reading other reviews and seems many people are having problems with them.
Like others posted there may be an issue with your head not making a good seal. Give carto tanks a try and see how you like it, the Artemas tank from Madvapes is a really nice cheap one.