Voltrex Second Stage. Compact, rugged, state-of-the-art second stage, equipped with the V.A.D.(Vortex Assisted Design) system. Its nickel and chrome plated brass case assembly and its ultra-light technopolymer cover specially shaped to enhance water delivery - endow this second stage with exceptional diving comfort, which is also possible due to its very low weight: 270g only. The Teflon lever and super-flow hose guarantee consistent high performance even under the most severe conditions.  Its antifreeze function is enhanced by the optimum heat conductivity of its metal walls, since they rapidly scatter the cold due to air expansion during inhalation in the water. 

Nikos Second Stage.  Its second stage features the new "controlled Venturi" air delivery system. The air flow from the first stage is directed into the mouthpiece by a special-shape vane. The flow is then diffuse and breathing becomes pleasant, since the depression created in the second stage helps draw the diaphragm inward reducing inhalation efforts.  Extra simple, great performance. Its body is made of a special technopolymer, with threaded cover and overmolded water holes to limit the risk of free flow when diving through a current.  Its bellows diaphragm allows perfect air flow channeling. Nikos is fitted with the MR 12 first stage, a guarantee of great performance and absolute reliablility.