You can use ANY topper pretty much on a REO if you choose the low profile version. But you would only use it as intended with a bottom fed rebuildable atomizer. Rob sells those too. As long as you use recommended batteries and builds over. 06 ohms, you should be fine. When the quality of your vape declines it's an indicator to swap tour battery.
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Actually they all ship with the upgraded contacts now. You can go low sub ohm with no problem. I stay about 1 ohm but the new contacts also really make a difference on the voltage drop and battery life.
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