Adult Black and Red PU Swimming Snorkle with Silicone Mouthpiece for Swimmer Training

Quick Details:
Mouth piece: Silicone 
Valve: PC+Silicone
Tube: PU

Description:
Center-Snorkel design: Allow swimmers to use relax in the water and focus to improve the swimming technique. For snorkeling and swimming training.
Patent design for back exhaust bubbles don't affect the line of sight, and no residual water 
Adjustable plastic holder, for swimmer easy to adjust holder 
Comfortable silicone mouthpiece
Special tube design to reduce water resistance

Application:Diving and fresh air

Advantages for Snorkel:
Floating ball: Its' drag top has a floating device design that close the opening while the snorkel submerges under the water, and it re-opens after the snorkel come back to the surface.
Tube: keep fresh air in the tube
Soft tube: the shape like whorl, easy to bending and stretch
Single-track valve film: prevent water fast into the tank and prevent dioxide gas in the pipe retention
Double diaphragm: separation fluctuation tank: prevent water directly into the mouth; inhale fresh air unidirectional; Exhaust to hold unidirectional
Discharge membrane: Is used for drainage and eliminate the waste gas.