The respiratory conduit includes {HEAD ~ at least two air flow control devices}, positioned between {TAIL ~ the patient interface device} and the pressurized air generating device 
positioned between
The respiratory conduit includes { HEAD ~ at least two air flow control devices } , positioned between { TAIL ~ the patient interface device } and the pressurized air generating device
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH