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Material Description:
Tube body --PVC， environmentally friendly materials， anti-aging. Mouthpiece - liquid food-grade silicone， colorless， not aging， cracking and comfortable.
Ferrule --PC. Sealing valve - Silicone closed better. Outlet valve guide sheet - Silicone.
Fixed tube clip - steel， a lot of products for the ABS or PC， it is easy to break.

working principle:
Dive deep in time， the tube head into the water， buoyancy plug (middle empty) by the buoyancy of water， driven by sealing valve seal inlet. So water can not enter the tube， and when the tube head above water when the buoyancy sink stopper， sealing the intake valve to leave， so that you can breathe freely.

Note: The difference between the breathing tube and dry sub-dry and semi-dry， please do not think dry is all dry， many buyers will mistake Oh!



Dry breathing tube sub pipe (all dry and semi-dry) and wet-pipe: Fully dry tube can ensure there will be no water into the tube when the dive， but the wet pipe is not guaranteed and semi-dry. After breath dive float to the surface， wet pipe needs to pour out the water and semi need to summon the gas at the fill pipe water from the inlet pipe and drain valve at the head blown off， and then inhale.

Pro， if you find a breathing tube leakage， perform the following operations at two o'clock， it will not leak: 1， top of the piston stuck leaks， do not get stuck at the card firmly shake， shake ring for not leaking. 2， under the following row head leaking at breather port valve gasket where there are gaps with sand into the cause， or the cause after the bump pads loose uneven. In such cases， you can make some adjustments yourself pads method: breathing valve a little harder to pull off， the sand clean the gasket at the interface， and then compress the gasket， can be solved.