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