Diving breathing tubes do half a good job or do a good job?
Help users (whether novice or experienced) reduce choke water, breathe easy, comfortable to use, extend dive time etc.. Very suitable for snorkeling at the seaside, Hainan, Maldives tourism essential
If the integrity of the equipment, it is all dry, good, because all dry, with a number of countries and regions patented anti wave upstream and down drain valve design
And the good water, choose a half dry can also, half dry, not to dry all kind of anti wave on the head. It's a simple anti wave head.
