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