Bubbler is a simple flashback device, used to prevent the burning gas from entering the HHO gas generating chamber and creating an explosion. The device by design can itself explode the quantity of gas in the head space above the water, destroying the bubbler, spreading the diluted catalyst and shrapnel from the container. For safety, reduce the head space to the bare minimum needed, change the water on some schedule to prevent the catalyst becoming strong enough to create chemical burns.
The bubbler is s simple safety device which is typically your last line of defense against flashback. This unit is typically a tube filled halfway with water. HHO enters the chamber from the bottom and bubbles to the top where it continues to your air intake. In the rare event of a backfire, the water in the bubbler will prohibit the flash from ruining your HHO Generator.