The instant invention is a valve mounted on the above water end of a skin diving
snorkel. The valve's opening is in-line with the snorkel's longitudinal axis, thereby
providing a substantially straight and unrestricted respiratory flow path. The
valve consists of a soft diaphragm mounted on a compound linkage. The linkage is
attached to the conduit adjacent the valve opening. A float activates the valve
linkage whenever the snorkel starts to descend below the water surface. By the
time the valve end of snorkel is underwater, the linkage has moved the diaphragm
over and against the valve opening thereby preventing water from entering the snorkel.
Conversely, when the valve end of the snorkel is above the water surface, the linkage
moves the diaphragm to the side of the snorkel, completely away from the opening
and out of the respiratory flow path.
