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MK25 EVO/D420

Combining the iconic design of the original D-Series regulators with the latest advances in breathing performance technology, Scubapro engineers have created a 21st century regulator in terms of quality, reliability, performance and style.



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MK25 EVO/D420

The new D420 features a brand new balanced valve inside a housing supported by a full metal structure. Called the Progressive Flow Control Valve, it is able to deliver abundant airflow for the best breathing performance, with a natural smoothness comparable to what you might experience breathing on the surface.

The uniquely shaped fiberglass reinforced nylon casing is ultra-durable and allows the LP hose to be connected on either the right or left side for maximum rigging flexibility. A new dive/pre-dive system includes a switch on the top of the casing with a thumb tab for adjusting the direction of airflow right out of the valve. The highly efficient purge button is a technical jewel based on a new concept that gives the D420 its unique face.

Teamed with the venerable MK25 EVO balanced piston first stage, this is a regulator system purpose-designed for today’s avid divers and Scubapro brand enthusiasts everywhere.


Features first stage
  • Air balanced flow-through piston design delivers consistent and effortless airflow,
    regardless of depth, tank pressure, or breathing rate.
  • Patented XTIS (Extended Thermal Insulating System) fully insulates the inner
    mechanism from the environment, improving cold-water resistance by 30% and
    delaying ice formation in extreme cold-water conditions without compromising
    breathing performance. Key insulation system components are visible in blue.
  • 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.
  • Five high-flow and one axial super high-flow low pressure ports on a swivel turret
    maximise hose routing options.
  • External intermediate pressure adjustment enables technicians to fine-tune
    performance quickly and easily.
  • Weight: INT 232, 790g; DIN 300, 572g.
  • Airflow at 2900psi/200bar: (l/min/SCFM): >8500/301.
  • Intermediate pressure (psi/bar): 133-142/9.2-9.8.


Features second stage
  • Uniquely shaped fiberglass-reinforced nylon casing carries on the D-Series
    heritage with the latest advances in breathing performance technology.
  • Air-balanced Progressive Flow Control Valve is able to deliver abundant
    airflow with a natural smoothness comparable to breathing on the surface.
  • Dive/pre-dive system includes a switch on the top of the case with a thumb
    tab for adjusting the direction of airflow right out of the valve.
  • Casing design features inner winglets that direct airflow towards the exhaust
    valve, creating a dramatic improvement in exhalation effort.
  • Diaphragm is located in the lower section of the casing to take advantage of
    the pressure gradient in the upright position, making breathing even easier.
  • Reversible hose attachment allows for either left- or right-side LP hose
    connections for maximum rigging flexibility.
  • Large purge button is easy to reach and press, with or without gloves.
  • Exhaust tee is compact and efficiently deflects bubbles from the diver’s view while
    enhancing ease of exhalation.
  • Super-flow hose features an oversized bore that allows more air to flow on each
  • Compact Hi-Flow mouthpiece improves airflow as well as mouth comfort, fitting all
    mouth sizes, from largest to smallest.
  • CE certified according the latest EN250A European Standards for all diving
    conditions, including extreme cold water.
  • Weight (without mouthpiece): 216g.
  • Airflow at 200bar: 1800 l/min – 64 SCFM.


scubapro xtis


2nd Stage Design Balanced
1st Stage Type Piston
2nd Stage Series D Series
Water Temperature Cold, Temperate, Warm
Connector Type DIN and INT
Nitrox Mix Up to 40%
HP Ports 2
LP Ports 5
1st Stage Materials Chrome-Plated Brass
2nd Stage Materials Metal Components, Carbon Fiber Cover
Product Weight 1.2 kg / 2.6 lb
Adjustable 2nd Stage No
2nd Stage Valve Housing Material Technopolymer



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