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