Crown II Sub-Ohm Tank The Uwell Crown II Sub-Ohm tank is the updated version of the popular Uwell Crown. The Crown 2 features a large 5ml e-Liquid capacity quartz glass tank in a 24mm diameter stainless steel construction build to ensure durability and performance are at a premium. It also includes a leak resistant top fill design which utilizes a juice tank locking screw to help minimize leaks. The Uwell Crown 2 has an improved chimney design for stronger flavor. This tank also features a dual adjustable airflow ring at the base of the tank to customize your vaping experience to your own preferences. With the introduction of the new Bullet Coil platform featuring a a conical shaped positive connector Uwell has dramatically improved airflow and performance.