Assertion: snorkel's valve | /r/CapableOf | permit air
Facets:
value: to pass into the tube
type: PURPOSE
value: in such devices
type: LOCATION
Source sentences:
text: In such devices, a valve located in the distal portion of the snorkel tube permits air to pass into the tube when it is above water, but will close off when submerged to prevent the entrance of water.