The full face mask is tested, and is suitable for both small and large faces, with or without a hood.

At the front of the mask is a switch-over valve block with which the diver can switch between the re-breathing circuit and the bail-out breathing system. With this construction the diver does not have to remove the full face mask in an emergency situation when switching to the bail-out breathing system. The switch-over valve block is made of plastic.

The switch-over valve block has non-return valves that control the direction of flow of the breathing gas. Inhalation takes place through the hose that runs over the left shoulder and exhalation occurs over the right shoulder.

The hoses are connected to the IS-MIX with bayonet couplings that are interchangeable. This guarantees the flow of direction of the breathing gas.

The inside of the mask has an inner mask to minimise what is called “dead space” in which CO2-build up occurs. The mask is also fitted with a pressure equalizer