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