This is the price inquiry on Taobao in China：69yuan
New diving mask full dry diving mask adult swimming equipment full face double tube snorkeling masks
Dual Breathing Hose Snorkeling Mask
Free double-barrel external circulation breathing - no choking!
Combination of exhalation and inhalation
Prevents carbon dioxide buildup
Prevents asphyxia, hypoxia, etc.
From the Internet.Publisher：writer，Please indicate the source when turning around：https://www.machinery-agent.com/Hardware_tools/1345.html
