With two replaceable meshed coils and the adjustable bottom airflow system, TFV18 Tank is flexible to change tastes between DL and RDL. The XL bulb glass tube holds an ongoing vaping for you even if in need of going out. To fill the tank, you have to press the button and slide the top cap in the right way to expose the filling port, enhancing the security of use and ending juice leaking. Innovation keeps changing the vaping experience!