I saw many people using tanks on their Provaris so when I got mine I figured I'd have to try them out and see how they work for me. I got the baby "notta" tank from Stormy's vapor cellar since it was an affordable way to get into tanks and I liked the size. It's pretty bare bones, doesn't come assembled or anything, but for $10 you get the tank, o-rings, a pre-punched carto, and a syringe for filling the tank. Since I've been vaping 100% VG (Boba's!), the syringe is pretty much worthless, the juice is just too thick for the needle. So to refill, I've just been taking off the top o-ring and directly filling the tank. Unfortunately there's not really an "easy" way to do this, I have to wedge something in between the tank and o-ring to pry it out. Not a huge deal, but not the easiest solution either. The o-rings do fit quite snugly on the carto, so it's quite solid and there's minimal slipping, no issues grabbing the PV from the tank.
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It serves it's purpose well, but I've been wanting something a little easier to refill and "prettier", if you will. Absolutely LOVE the lava tanks, but it's anybody's guess as to when another sale will happen, although I've heard maybe later in April. Found a bella tank (quite similar looking to the lavas) on the classifieds yesterday, and it should be here later next week!
Would love to hear the comparison from someone with a Lava tank and the other one