The fluid, in turn, may be conducted away from the window by a pump, for example, and {HEAD ~ its flow} may be regulated by {TAIL ~ a valve} 
regulated by
The fluid , in turn , may be conducted away from the window by a pump , for example , and { HEAD ~ its flow } may be regulated by { TAIL ~ a valve }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL