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