Waterproof case for keys, smartphone
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This individual filter allows to avoid "pollution" of a diving block when inflating if there is a doubt about the quality of air (due to a bad maintenance) delivered by the compressor. Also ideal for protecting your "Oxy-clean" blocks.
The non-return valve avoids explosions in case of bad manipulation during the inflation procedure. If the pressure in the O2-filled diving block is higher than the pressure upstream of the overfilter, the valve will prevent a return of Oxygen into the cartridge and avoid the auto-ignition of the activated carbon by temperature rise (adiabatic compression).
Please note, this overfilter is not suitable for inflation with pure oxygen.