a fluid pump unit operable to perform one of {HEAD ~ discharge} of {TAIL ~ fluid} at least to the fluid channel unit and suction of fluid at least from the fluid channel unit 
of
a fluid pump unit operable to perform one of { HEAD ~ discharge } of { TAIL ~ fluid } at least to the fluid channel unit and suction of fluid at least from the fluid channel unit
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH