The X2O Sub TF Tank includes a solid Delrin top cap that unscrews with ease to allow juice to be inserted into the top of the tank at any time. The fill holes are conveniently curved eyelets to ensure that all of your juice gets into the tank so you can vape every drop. A great feature that will speed up filling times and eliminate the messiness that can come from bottom filling. With an industry leading 0.3 ohm vertical coil and dual adjustable airflow control this 2.5ml capacity tank boasts excellent vapor production that will easily satisfy your most seasoned vapers. If you are looking to utilize your temperature control device look no further because it is compatible with our Ni200 coils. This is a sub-ohm tank that is practical for every vaper from beginner to expert!