The pressure regulators may be pressure regulating screws or valves, or they may comprise dispensing conduits having various cross sectional areas or {HEAD ~ reservoir conduits} having {TAIL ~ various cross sectional areas} 
having
The pressure regulators may be pressure regulating screws or valves , or they may comprise dispensing conduits having various cross sectional areas or { HEAD ~ reservoir conduits } having { TAIL ~ various cross sectional areas }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL