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