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