The water transport unit includes a moisture donating fluid channel and {HEAD ~ a moisture} accepting {TAIL ~ fluid channel}, where the latter is fluidly connected with a portion of the fuel cell that is in need of humidification 
The water transport unit includes a moisture donating fluid channel and { HEAD ~ a moisture } accepting { TAIL ~ fluid channel } , where the latter is fluidly connected with a portion of the fuel cell that is in need of humidification
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH