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The Volcano replacement cartomizers for your Tube Tank are superb value! If you have a Lavatube you are advised to use the 3 ohm carts as the higher resistance allows you to use the full range of the Lavatube's power variability; the 1.5 ohm ones should only be used at the lower end of the power output. If you still use a Tube Tank for your Inferno then you need the 1.5 ohm carts as the 3 ohm ones are not suitable.
Note that the Tube Tank for the Inferno has now been superceded by the brand new BCT system, and it's worth giving it a go!