Assertion: snorkel's valve | /r/HasAspect | mean
Facets:
Source sentences:
text: In order to provide for the selective breathing of either ambient air or tank-supplied air, valve means 25 further includes a valve core 48 that is slidably received in bore 32, valve 25 having means to allow the diver to selectively slide the core from one position to another and valve core 48 being provided with two air passages 50 and 52.