{HEAD ~ a positive displacement pump} located below said containers and having an inlet and {TAIL ~ an outlet}, the outlet being connected to a nozzle; and 
{ HEAD ~ a positive displacement pump } located below said containers and having an inlet and { TAIL ~ an outlet } , the outlet being connected to a nozzle ; and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH