As shown in FIG 3, {HEAD ~ a sealing means} is provided which includes an O ring 18 which cooperates with the flange 20 of {TAIL ~ an Eppendorf tube} 23 
As shown in FIG 3 , { HEAD ~ a sealing means } is provided which includes an O ring 18 which cooperates with the flange 20 of { TAIL ~ an Eppendorf tube } 23
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH