RRP: £378

Free UK delivery on all orders over £50
  • Simple to use 2nd stage with no dive adjustment controls and a reduced chance of free flow.
  • Double swivel hose for greater freedom of movement and comfort.
  • Patented heat exchanger surrounds the valve mechanism, dissipating the cold.


The Apeks MTX-RC Octopus delivers the same outstanding cold water performance as the MTX-R regulator but is finished with a high visibility yellow front cover, inlet trims and low pressure hose. The MTX-R range were designed in accordance with the United States Navy Experimental Dive Unit extreme cold water test.

As with the primary regulator, the octopus does not have any diver adjustable controls and has been specially adjusted and modified for optimal performance in the extreme cold water conditions specified in the US Navy test.

To help combat ice forming on critical components in near freezing water whilst performing at 60m the octopus is fitted with a large heat exchanger around the hose inlet that works to draw the cold created in the pneumatically balanced valve as the compressed gas from the first stage is depressurised into the housing. At the same time it also helps to transfer heat from the surrounding water back into the valve and housing.


Protective bumpers to protect the second stage from impacts and scratches in the most vulnerable places.
Ergonomic and simple to use venturi lever.
Oversize breathing effort adjuster makes adjustment easy in cold water whilst wearing gloves.
Large purge button.
Reversible second stage for either a left or right hand gas supply configuration.
A heat exchanger (patented) dissipates the cold caused by gas expansion while drawing in the warmth of the ambient water for a more comfortable breathe.
Features an innovative Diver Changeable Exhaust system (DCE). The system gives the diver the ability to change from a small exhaust tee to a large exhaust tee. The regulator is supplied with both sets of exhaust tees.
Comfo-bite mouthpiece
Flexible nylon braided hose, which has better cold water performance than traditional rubber hose.
Designed and manufactured in the UK.
No single-use plastic in the packaging


Connections Yoke and DIN available
Type of first stage Over-balanced diaphragm design, environmentally sealed
Body Type One piece forged body
DIN 1st stage – 638g
Yoke 1st stage – 763g
2nd stage – 154g
Number of HP ports 1 (7/16″ UNF)
Number of MP ports 4 (3/8″ UNF)
Environmental Dry Kit Standard
First stage exterior Satin
Coldwater Use Yes
Type of second stage Pneumatically balanced
Opening Effort Control Knob No
Integrated Venturi Lever Yes
Mouthpiece Comfo-bite™
Exhaust tee Standard, one set
Heat Exchanger for freezing resistance Yes
Hose type Braided Flexi-hose
Overall work of breathing (WOB) scores Avg. 0.90 joules/liter
Nitrox compatible Yes to 40% O2 when new, out of the box / Can be O2 cleaned to 100%.


Scuba Dive Store always offer an extended returns policy of 30 days – so you can rest assured that if the suit, piece of diving equipment or gift doesn’t suit then just send it back and we will either exchange it or offer a full refund less any postage costs. Please return the item to the following address:

Scuba Dive Store
Valley Rd

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