Assertion: diver | /r/CapableOf | deflect the diaphragm
Facets:
value: to open the valve
type: PURPOSE
value: manually
type: MANNER
Source sentences:
text: A standard fitting on single-hose second stages, both mouth-held and built into a full-face mask or demand helmet, is the purge-button, which allows the diver to manually deflect the diaphragm to open the valve and cause air to flow into the casing.