{HEAD ~ A second hub assembly} is sealingly engageable with a second axial opening on {TAIL ~ the other side} of the tire 
{ HEAD ~ A second hub assembly } is sealingly engageable with a second axial opening on { TAIL ~ the other side } of the tire
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH