ScubaPro - MK25AF / S555

This regulator system features a high flow first stage with an air balanced high performance second stage chosen by military divers for its durability, simplicity, and reliability.

MK25 First Stage

• An unfailing performance, due to patented design
  The MK25 first stage can accept all types of SCUBAPRO second stages, and will be your favorite for all diving experiences.
• Machined marine grade chrome plated brass body
  Excellent resistance to corrosion, long lasting, and excellent value for its price.
• Patented over balanced composite/stainless steel piston
  Faster dynamic response and extra high flow, ultra stable intermediate pressure at all tank pressure.
• Thermal Insulating System (TIS) on piston and spring
  Cold water resistant. Exceeds CE cold water diving requirements.
• Externally adjustable intermediate pressure (patent pending)
  Easy and fast adjustment by authorized technician.
• 5 High flow low pressure swivel ports
  Ergonomic distribution of the hoses for less jaw fatigue and full option for octopus and accessories.
• Dual high pressure ports
  Console or pressure gauge can be mounted either right or left hand.
• Available in 232 bar yoke or DIN system
  Versatile use depending on geographical region.
• New wound conical single stainless steel wire filter
  Improved flow characteristics for absolute safety will prevent clogged filters from exploding.
• Enlarged water balancing chamber holes
  For cold water diving, improves heat transfer and increases resistance to freezing. Exceeds CE cold water norms at 300 bars.
• Also available in Titanium and Stainless Steel Alloy version

S550 Second Stage

An air balanced high performance second stage chosen by military divers for its durability, simplicity, and reliability. This second stage is also preferred by sport divers and diving instructors that do not need external adjustment of inhalation resistance.

• Air balanced linear flow valve
  Highest performance in any condition.
• Precision molded carbon fibre/technopolymer valve housing and components
  Low friction, lightweight, corrosion and cold water resistant. Exceeds CE cold water norm.
• Diver adjustable VIVA
  Prevents free flow on surface for cold water diving or when used as an octopus or for buddy breathing.
• High flow exhaust valve
  Lowest exhalation effort for best breathing comfort.
• Lightweight orthodontically designed mouthpiece
  Designed for comfort as well as for reducing jaw fatigue and gum irritation.
• Compact design
  Lightweight for comfort and travel.
• Compatible with MK25AF, MK18, MK16