This gas silencer is intended for discharging air from diving tanks. Anyone who has had to discharge old, leftover breathing mix knows what a problem it is to keep the hiss of the released air to a reasonable level even during relatively slow discharge.
The silencer attaches to the tank valve and the old air can then be discharged within a few minutes, even in a closed room or on board a boat, for example. Thanks to this effective silencing, noise does not exceed a level that would make conversation difficult in close proximity to the tank.
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