The reducing agent can circulate between {TAIL ~ the delivery device} and {HEAD ~ the reactant reservoir} thereby, particularly when the dosing valve is closed, preventing the reactant from freezing 
The reducing agent can circulate between { TAIL ~ the delivery device } and { HEAD ~ the reactant reservoir } thereby , particularly when the dosing valve is closed , preventing the reactant from freezing
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH