May be helpful to mention that the Arry Act v3 and v4 are different from most. The whole cartomizer goes in the tank. The air does go thru the cart ( of course ) but comes in through the fitting on the bottom of the tank. My v3 is wonderful running 3.2s at 5v. The only, and I do mean only, leakage is the 2 - 4 drops forced thru the bottom fitting when filling. She's tight as a drum.
