If your extreme cold diving requires the AquaLung Legend Glacia regulator, then this is the complimentary octopus that you need.

The AquaLung Legend Glacia Octopus features ...

• Fitted with an aluminum cover machined from solid metal. The metal cover, apart from assisting the heat exchange, accommodates a purge button with flow control
• Heat exchangers surrounding the valve and in the middle of the hose provide excellent freezing resistance
• Heat exchanger fitted in middle of 39" yellow hose