An RDA is a rebuildable dripping atomiser, a device for vaping that includes rebuildable atomiser coils and requires regular topping up with e-liquid. Vapers choose RDAs because they’re looking for more precise control, better reproduction of flavour and more vapour production.RDTA stands for rebuildable dripping tank atomiser, an advanced device for heating your e-liquid to transform it into vapour. People choose these devices because they offer excellent flavour reproduction and copious clouds of thick vapour.There can confusion about the difference between an RDTA and an RDA, a rebuildable dripping atomiser. In simple terms, the RDA has no tank, just a shallow reservoir beneath the atomiser coil which needs fairly constant refilling, while the RDTA has a tank which feeds the coil automatically. Tanks may have a capacity of anything from 2 to 5ml, so they need refilling much less frequently.