JUST APEKS 4th Element's Online Store

$644.00 $1,166.00
Size:  Apeks MTX-R Assembled complete with flexi hoses DIN


Brand new from Apeks comes the MTX-R. The MTX-R is based on the MTX military regulator and is a super tough, rugged, high performance, go anywhere regulator. Sets come boxed, and assembled with flexi hoses, the regulator bags can be bought separately. 


The MTX-R has excellent cold water performance and has a greatly reduced risk of free flow. This has been achieved by improving several areas, including an innovative endcap and enviromental diaphragm, a forged 1st stage body offering maximum thermal preference, a ribbed diaphragm clamp and a redesigned & enlarged heat exchangeron the 2nd stage with metal incorporated into the front cover design.

This regulator is designed to meet all aspects of the NEDU (Navy Experimental Dive Unit )military requirements for diving in very cold water. The MTX-R is highly reliable and also very easy to service out in the field.


1st Stage


Available in yoke or DIN configuration.

Suitable for cold water use (below 10°C / 50°F)

Unique over-balanced diaphragm design – as the diver descends, the over-balancing feature allows the medium pressure gas in the hose to increase at a faster rate than ambient. This results in superior performance at depth.

Over-moulded innovative endcap and enviromental diaphragm, a forged 1st stage body offering maximum thermal performance,

The 5th 3/8" UNF UNF medium pressure port includes a protective bumper when not in use.

Forged first stage body with heat exchanging ribs for maximum thermal performance.

Angled HP ports for optimal hose routing and fitting of transmitters.

Forged rotating turret with medium pressure ports in a parallel direction for improved hose orientation.

Ribbed diaphragm clamp for improved heat exchange in cold water conditions.

Double swivel hose for greater freedom of movement and comfort.

Tested for Octopus use - EN250A to ²²/ 197ft cold water.

Nitrox/Oxygen compatible – Up to 40% O² outside the EU (European Union), within the EU anything above 21% O² must use an M26 Connection.


2nd Stage


Simple to use with no dive adjustment controls and reduced chance of free flow occurrence, pre-settable cracking effort or venturi control by an Apeks approved qualified technician.


High performance, pneumatically balanced, lever operated poppet valve.

Large, diver friendly self-flushing controllable purge button.

Front cover with over-moulded elastomer incorporates a formed chrome plated brass plate improving durability of the second stage.

Large protective elastomer bumpers on the side and on the top to protect the second stage from impacts and scratches in the most vulnerable places.

Reversible second stage for either a left or right hand gas supply configuration.

A heat exchanger (patented) which surrounds the valve mechanism, dissipates the cold caused by gas expansion while drawing in the warmth of the ambient water.

Comfo-bite mouthpiece

Double swivel hose

Flexible nylon braided hose has better cold water performance than traditional rubber hose.

Simple service kits

Easy to service.