A third one of the outlets/intakes of the connector communicates with {TAIL ~ the cavity} of {HEAD ~ the hose} 
A third one of the outlets / intakes of the connector communicates with { TAIL ~ the cavity } of { HEAD ~ the hose }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD