In alternate embodiments, {HEAD ~ the pressure regulators} are pressure regulating screws, valves, dispensing {TAIL ~ conduits} having various cross sectional areas, and reservoir conduits having various cross sectional areas 
are dispensing
In alternate embodiments , { HEAD ~ the pressure regulators } are pressure regulating screws , valves , dispensing { TAIL ~ conduits } having various cross sectional areas , and reservoir conduits having various cross sectional areas
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH