The compressible portion of the receiving swab is located inside the casing, wherein by compressing the compressible portion, {HEAD ~ the transfer path} is closable towards {TAIL ~ the outside} of the device 
is closable towards
The compressible portion of the receiving swab is located inside the casing , wherein by compressing the compressible portion , { HEAD ~ the transfer path } is closable towards { TAIL ~ the outside } of the device
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 HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH