The Double Barrel Vaporizer
Double the pleasure, double the fun, Double the Barrel with a vaporizer engineered to load and fire a duo of different oil cartridges at once. Just like the double barrel pistol, except, uh...not a gun.
Aside from a diagram of the Double Barrel Vaporizer's two-channel, one-airflow layout, plus the above how-to video, the vape's makers don't have too much to say about its design and construction. They do mention it's for the "sophisticated-yet-overlooked connoisseur" of the vaping world, so if it wasn't already obvious, the Double Barrel Vaporizer is for you, hipsters.