The Kanger T3'D is filled from the bottom. If the Kanger T3'D atomizer head fails unexpectedly and the tank is filled with eLiquid, the atomizer head (base) can be easily replaced without the need to drain the eLiquid in the tank first.
To fill the Kanger T3'D unscrew the bottom atomizer head. Hold the tank upside down and fill with approx. 2ml of eLiquid. With the tank mouthpiece-end down, screw the atomizer head back on.