Patent ID: 8603417

Claim:
In combination, a tube and cap for retaining an aliquot of fluid suitably for transferring such samples within a laboratory or between laboratories, the combination comprising: (a) a transfer tube including: a tube portion having at least one sidewall defining an open top, a flange extending outwardly from and flush with said open top and including a top surface and a bottom surface, at least one channel in said top surface of said flange, and an internal closed bottom extending from said at least one sidewall, (b) a cap including: at least one peripheral wall, a hub inset from said at least one peripheral wall, a plurality of ribs extending from said hub to said at least one peripheral wall to strengthen said at least one peripheral wall against forces inward toward said hub, a neck having at least one bubble ring, a rim extending from said neck, at least one sealing rib extending from said rim, wherein, when said cap is secured to said transfer tube, said neck extends into said open top of said transfer tube and said at least one bubble ring sealingly contacts said at least one sidewall, at least a portion of said rim lies flush on said top surface of said flange, and said at least one sealing rib extends into said at least one channel.