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