When the collection swab is inserted into {HEAD ~ the transport tube}, the swab pushes the rehydrated media plug through the region of restricted diameter and into {TAIL ~ the bottom} of the tube 
When the collection swab is inserted into { HEAD ~ the transport tube } , the swab pushes the rehydrated media plug through the region of restricted diameter and into { TAIL ~ the bottom } of the tube
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH