The RBC (Redux Bottom Coil) is a bottom coil clearomizer based after the look of the Redux Clearomizer. But it is a completely different design. The RBC, using the bottom coil, provides a nice warm vapor, with a superb clean flavor, and reduced wicking issues. Also different is the body design. There is no longer a removable drip tip at the top. It is more of a molded translucent uni-body design that unscrews from the bottom for filling and to replace the coils.
To fill the RBC: unscrew the bottom atomizer head, hold the tank upside down and fill with about 1.5 ml of eLiquid. With the tank mouthpiece-end down, screw the atomizer head back on. To replace the heating element unscrew the bottom of the clearomizer. The heating element unscrews from the base.