The tube has {HEAD ~ a media plug} impregnated with {TAIL ~ dehydrated media} positioned within the tube near the top of a region of restricted diameter, and a compartment of rehydrating fluid located in a cap on the tube 
impregnated with
The tube has { HEAD ~ a media plug } impregnated with { TAIL ~ dehydrated media } positioned within the tube near the top of a region of restricted diameter , and a compartment of rehydrating fluid located in a cap on the tube
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL 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 OTH OTH OTH OTH OTH OTH OTH