an end cap coupled to the stack for defining an anode air stream plenum in {HEAD ~ fluid communication} with {TAIL ~ the anodes} 
an end cap coupled to the stack for defining an anode air stream plenum in { HEAD ~ fluid communication } with { TAIL ~ the anodes }
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