The Viper is one of a small number of regulators with side exhaust. The advantages of side exhaust include that there is no right or left, nor up or down, so the primary hose can come from the right or left. Also, if you share air with another diver, either of you can use the second stage without changing positions, bending the hose or having the regulator end up upside-down. Another advantage is the greatly decreased bubble interference. In fact, a slight tilt of the head to the right completely eliminates bubble interference. The side exhaust also means the exhaled bubbles do not strike the second stage, and, therefore, there is no vibration on exhale. Light weight, compact, symmetrical shape, make the MV Viper the ideal Regulator. Easy to dive with, and equally easy to use on the right or the left, for increased safety.