{TAIL ~ a casing} having {HEAD ~ a pump port}, a tank port, and an output port, 
{ TAIL ~ a casing } having { HEAD ~ a pump port } , a tank port , and an output port ,
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH