Uwell Whirl 2 Sub-Ohm Tank is an upgraded version of Whirl Tank, with a diameter of 25mm, with optimized top cover and base design, optimized filling system, Self-Cleaning Technology, is the perfect atomizer for the vaper looking for versatility, which is suited for both Restricted DTL (Direct-to-Lung) and MTL (Mouth-to-Lung) Vaping.