Stopcocks made of PMP. Plugs of PTFE with polished surfaces turn easily but fit tightly. Insert with two seals.
Available in 25 ml and 50 ml:
25 ml: For tubes with an inner diameter of 7.75 ± 0.1 mm.
50 ml: For tubes with an inner diameter of 11.5 ± 0.1 mm.
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