eet the Geek Vape Z Fli Tank, a sub-ohm tank designed to optimize e-liquid refilling efficiency. Its notable feature is the top airflow design, guaranteeing a leak-free experience. This design also provides enhanced control over airflow, making adjustments easier and more precise, ultimately contributing to a smoother and richer flavour experience. Sub Ohm Tank DTL Vaping Top Airflow Leakproof System Top Fill Design Precise Airflow Control 810 Drip Tip Z Coils.