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