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Pyrex® ground-glass stopper, joint: ST/NS 24/40, Full length, closed at bottom
Pyrex® ground-glass stopper, joint: ST/NS 14/20, Combination reagent bottle/ground joint, hollow
Pyrex® ground-glass stopper, joint: ST/NS 19/22, Combination reagent bottle/ground joint, hollow
Pyrex® ground-glass stopper, joint: ST/NS 24/30, Combination reagent bottle/ground joint, hollow