The Uwell Crown Sub-Ohm Tank gets a refresh, we present to you the new Uwell Crown 4 Tank! The Uwell Crown 4 presents a 28mm diameter, a 6ml max e-liquid capacity, and the all-new Crown 4 coil system. The Crown 4 offers sleek and compact design with striking visual design. The Crown 4 Tank is smaller than the previous versions and offers a unique premium feel. It features 90 degree top fill cap that when opened exposes 4 large fill ports. The Uwell Crown 4 Tank offers a 6ml e-liquid capacity with bulb glass tube and 4ml e-juice capacity with the standard glass tube. The improved Crown 4 Plug and Pull replacement coil style features reinforced seals to provide liquid-tight fit and finish. Each coil features a vertical coil arrangement and triple vertical wicking slots for rapid wicking. The Crown 4 Replacement Coils consist of unique materials such as the SS904L and the FeCrAl (Iron, Chromium, Aluminum) Coils. The Crown 4 Coil Family comes with a 0.2ohm Dual SS904L, a 0.4ohm Dual SS904L coil, a 0.25ohm SS304 UN1 coil, and finally the 0.23ohm FeCrAl UN2 coil. The Crown 4 integrates patented self-cleaning technology that reduces vape juice leakage, waste, and lessens cleaning frequency. The Crown 4 Tank has 3 airflow holes that are adjustable for maximum cooling of coils and large vapor production. The Uwell Crown 4 Sub-Ohm Tank is the perfect mid-wattage featuring superior construction, a conventional technology, and ergonomic designs throughout.