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