The sleeve extension 151 has {HEAD ~ a free end} 155 located in {TAIL ~ the region} of the outlet apertures 152 
located in
The sleeve extension 151 has { HEAD ~ a free end } 155 located in { TAIL ~ the region } of the outlet apertures 152
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH