The all-new Z-Force tank has been fine tuned for DL and RDL vaping. Precise airflow design delivers massive vapor production, dense flavor, and a smooth draw, whether you prefer open airflow or a more restricted experience. Spring loaded automatic juice flow control prevents leaking and wasted e-liquid. Now, you can change your coil with a full tank! When the coil is removed, the juice flow control is automatically closed, preventing any e-liquid from escaping. Leaking is a thing of the past.