This Scubapro regulator combines the high peformance balanced piston MK25 first stage with the retro styling of the new G260 balanced second stage. The MK25 is Scubapro's flagship first stage that uses an extremely high performing balanced piston design to offer very fast responsiveness and an incredible flow rate regardless of depth of cylinder pressure. The MK25 isn't environmentally sealed so to increase the cold resistance the first stage incorporates a combination of special anti-freeze coatings, sleeves around the piston and heat exchanger fins on the body to dissipate the cold into the surrounding water. Five low pressure ports are provided on a swivelling low pressure turret that offers optimal hose routing and two high pressure ports are provided on the main body.