The Green Machine by Grace Glass is a multi functioning recycler with plenty of cool and fun twists. Its first feature is the handy built-in flue design downstem, it takes the smoke and spreads it into the water chamber via an inline diffuser which is color coded in green. The smoke then rises out through the top tube whilst the water travels up through the side tube, the two then meet again in the triangular shaped chamber and the water falls back through the top tube into the main chamber. Creating movement in the water like this stops it going stale and creating bad tastes. The mouth piece, in matching green, has a huge flare on it creating a comfortable resting place for your mouth.