7
English
Coaxial fl ow
The valve outlet is positioned coaxially in front of the mouthpiece, directing the air fl ow
straight towards the diver’s mouth. The absence of curves or corners means no turbulence
or fl ow reduction and higher breathing performance.
5.3 First and second stage features
The following tables summarize the specifi c features of SCUBAPRO fi rst and second stages.
First
stage
MK25T
MK25AF
MK2 PLUS
MK19AF
MK17AF
MK11
MK25
NITROX
MK2 PLUS
NITROX
Technology
Piston
Air-balanced
fl ow-through
Classic downstream
•
•
•
•
•
Balanced diaphragm
•
•
•
Materials
Chrome plated brass
body
•
•
•
•
•
•
•
Full titanium body
•
Cold water
Anti-freeze
protection (AF)
•
•
•
•
•
Dry chamber
•
•
Nitrox compatible up to 100% oxygen concentration
•
•
Ports
Intermediate pressure
Ports (IP)
5
5
4
5
4
4
5
4
High Flow Ports
(HFP)
5
5
4
5
2
2
5
4
High Pressure (HP)
Ports
2
2
1
2
2
2
2
1
Swivelling turret with
IP Ports
•
•
•
•
Confi guration
INT 230 bar
(3336 psi)
•
•
•
•
•
•
DIN 200 bar
(2900 psi)
•
•
•
•
•
DIN 300 bar
(4351 psi)
•
•
•
•
•
•
Dedicated Nitrox
EN144-3 200 bar
(2900 psi)
•
•
Externally adjustable intermediate pressure
•
•
•
•
Weight DIN 200 (g/oz)
-
577 / 20.4
470 / 16.6
766 / 27
610 / 21.5
535 / 18.9
-
-
Weight DIN 300 (g/oz)
350 / 12.4
592 / 20.9
485 / 17.1
781 / 27.6
625 / 22
550 / 19.4
-
-
Weight INT (g/oz)
480 / 16.9
825 / 29.1
706 / 24.9
1017 / 35.9
850 / 30
770 / 27.1
-
-
Weight EN 144-3 (g/oz)
-
-
-
-
-
-
632 / 22.3
526 / 18.6
Air Flow at 200 bar (l/min / SCFM)
>8500 / 301 >8500 / 301
2600 / 92
>6500 / 230 >6500 / 230 >5500 / 195 >8500 / 301
2600 / 92
Intermediate pressure (bar/psi)
9-9.8 /
130-142
9-9.8 /
130-142
8.5-9.8 /
123-142
9-9.8 /
130-142
9-9.8 /
130-142
9-9.8 /
130-142
9-9.8 /
130-142
8.5-9.8 /
123-142