A personal vaporizer has a hollow tube that extends from an atomizer through a tank for holding vaporization media. The hollow tube has a vapor tube portion and a filling path portion. A mouthpiece can be advanced over the hollow tube to a first position, at which the mouthpiece lumen communicates with the tank via the filling path portion. During manufacture, vaporization media can be injected into the mouthpiece lumen and will flow into the tank. After the tank is filled with vaporization media, the mouthpiece can be moved to a second position in which the tank is sealed relative to the mouthpiece lumen, but the vapor tube is unblocked so that the vapor tube communicates vapor to the mouthpiece lumen.