Uwell return in 2018 with the Crown 4, an evolutionary update to one of the most beloved Sub-Ohm Tank platforms in the history of our industry presenting a whopping 28mm diameter base chassis with a 2 milliliter max capacity along with the new and improved Crown IV Parallel Coil Design. The Crown 4 measures 28mm in base diameter and features sleek and smart design elements that combine for a universally appealing design. The Crown 4 features a 90 degree threaded top fill method that unscrews to reveal dual fill ports. The Crown 4 utilizes the new and improved Crown 4 Plug and Pull replacement coil style, with a threadless design that features reinforced seals to provide a liquid tight fit and finish. The adjustable bottom airflow makes for smooth and effective airflow, and can be fully closed to seal the system effectively. The Uwell Crown 4 Sub-Ohm Tank is an excellent midwattage tank with superior construction, a convenient Plug and Pull coil system, and ergonomic designs throughout.