A vape tank is one of the most important components of a vape kit. It serves as a reservoir to hold your e-liquid, contains the coil which is needed to vaporise the e-liquid, and has a mouthpiece which allows you to inhale the vapour. Most vape tanks will have a 510 connector that allows you to screw the tank onto your battery device. There are also some vape tanks that have a top-filling system for easy e-liquid refills and an adjustable airflow that enables you to tailor your draw.