{TAIL ~ The apparatus} 1 wherein the three way valve is located downstream of {HEAD ~ the pump} means 
{ TAIL ~ The apparatus } 1 wherein the three way valve is located downstream of { HEAD ~ the pump } means
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH