| 摘要 |
Disclosed is an improved snorkel using an adjustable valve mechanism having a rotatable restrictive plate to control the bottom opening area of the tubular body. The snorkel can be adjusted in terms of individual lung capacities so that the expiratory pressure may be applied to the water remaining in the tubular body so as to cause the simultaneous exhaust of the remaining water from the top and bottom ends of the tubular body.
|
