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

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