SCUBAPRO's best-selling air balanced second stage and its top-performing air balanced piston first stage is a match made in diver heaven. Well-known for its low work of breathing, year after year this combo has consistently ranked as one of the top-performing reg systems on the market. The MK25 EVO first stage lets you enjoy an ultra-fast breathing response, instant delivery of air on demand, great sensitivity and impressive airflow. The S600 delivers smooth and easy inhalation and exhalation while offering efficient user controls, including a powerful purge, an inhalation effort control knob and Venturi Initiated Vacuum Assist (VIVA). Together they provide a steady flow of air, regardless of depth, water temperature, or workload.

• Air-balanced flow-through piston in a chrome plated brass body provides constant and effortless airflow unaffected by depth, tank pressure, or breathing rate.

• Patented XTIS (Extended Thermal Insulating System) thermally insulates the inner mechanism from the environment, improving cold-water resistance and delaying ice formation in extreme cold-water conditions without compromising breathing performance.

• Anti-freeze protection radically increases breathing reliability when diving in the most extreme water temperatures.

• Two opposing high pressure ports allow the first stage to be positioned either up or down.

• Four high-flow and one axial super high-flow low pressure ports on a swivel turret maximize hose routing options.

• External intermediate pressure adjustment enables technicians to fine-tune performance quickly and easily.

• Air-balanced second stage valve smooths out the inhalation effort at varying depths and supply pressures.

• Second stage’s rugged reinforced technopolymer case and front cover with stainless steel frame looks good plus is extremely durable.

• Metal valve housing (barrel) is able to withstand years of aggressive diving.

• User controls include a diver-adjustable inhalation effort knob and Venturi-Initiated Vacuum Assist (VIVA) dive/pre-dive switch.

• Super-flow hose features an oversized bore (larger inside hose diameter) that allows more air to flow on each inhalation.

• Ultra-comfortable orthodontic mouthpiece is easy to grip yet doesn't inhibit airflow.

• Full regulator system package includes R105 Octopus

The R105 Octopus offers dependable breathing performance in a classic downstream design with a dive/pre-dive VIVA switch and reversible hose attachment.

• Classic downstream valve design for dependable breathing performance

• Metal valve housing is built rugged and increases overall reliability.

• Reversible hose attachment makes it easy to use on pony or deco tanks.

• High-viz yellow super-flow hose is 39in/1m long and features an oversized bore that allows more air to flow on each inhalation.

• Compact Hi-Flow mouthpiece improves airflow as well as mouth comfort, fitting all mouth sizes, from largest to smallest.

Adjustable Second Stage	Yes
2nd Stage Design	Unbalanced
Hose Length	39 in
Hose Length	1 m
Weight	0.831 lb
Activity	Recreational