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