The Kanger Subtank Vertical OCC Replacement Coils OCC (Organic Cotton Coil) vertical coils providing the finest flavour and massive vapour clouds. Available in 0.5 ohm, 1.2 ohm and 1.5 ohm, these replacement coils are an upgraded version of the original (horizontal) OCC coils and can operate at higher wattages than the originals. They are compatible with the Kanger Subtank series including the Subtank Plus, Mini & Nano. In addition to offering more pleasure, better performance and greater durability, the Subtank Vertical OCC Replacement Coils also offer ease of use. To change the coil, remove the tank, unscrew its base and take out the old coil, turning it anti-clockwise. Put in the new coil, tighten, return the base and re-attach the tank. It’s as simple as that. It is of utmost importance, however, to be careful to properly join the threads and not to tighten them too tightly.