The diaphragm is biased to a closed position and so seals the ink supply from {HEAD ~ the printhead} as a default condition even in {TAIL ~ the event} of a power failure 
The diaphragm is biased to a closed position and so seals the ink supply from { HEAD ~ the printhead } as a default condition even in { TAIL ~ the event } of a power failure
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH