The Eleaf MELO RT sub ohm tank atomizer features a retractable top (RT) fill solution which makes e-liquid refilling the easiest and most convenient ever. The ERL series coil heads are skillfully designed for ultra high power, enabling a huge amount of vapor production. The wide bore drip tip sits perfectly on the tank with a large diameter of 25mm. Airflow can easily be adjusted by turning the control ring with knurled design. In short, it's a great piece of vapegear!