I want to have a few more tanks for my eGo that aren't complete crap leaking all over the place. I know when I bought the Twist kit, the B&M vendor used plumbers tape on the tank bottom to help prevent leakage because they are really crap tanks. I want a few more cheap, but not crap ,tanks to put temporary or occasional juices in. I would still use my vivi nova 3.5's for my ADVs.