A compressing means is preferable over {TAIL ~ even simpler direct compression} of the compressible portion 20 by a user, as the compressing means may be adapted to provide a predetermined pressure force which is sufficient for closing the transfer path 35 from {HEAD ~ the outside} 
A compressing means is preferable over { TAIL ~ even simpler direct compression } of the compressible portion 20 by a user , as the compressing means may be adapted to provide a predetermined pressure force which is sufficient for closing the transfer path 35 from { HEAD ~ the outside }
OTH OTH OTH OTH OTH OTH TAIL TAIL 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 OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD