Assertion: snorkel | /r/HasAspect | a purge valve
Facets:
value: in the lower housing
type: LOCATION
Source sentences:
text: Even if the snorkel has a purge valve in the lower housing, if water remains after the initial purge, it is especially difficult to purge out the remaining water because the next forceful blast of air will more easily rush past the water out the snorkel tube top rather than opening the purge valve because significant water pressure holds the purge valve shut.