One treatment, {HEAD ~ conveying or lock chamber} respectively, is connected with {TAIL ~ the at least two openings} 
is connected with
One treatment , { HEAD ~ conveying or lock chamber } respectively , is connected with { TAIL ~ the at least two openings }
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL