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Merck
Serrated silicone rubber septa bottom O.D. 19.5 mm, fits neck I.D., 17.5 mm, ST/NS: 19/22

Serrated silicone rubber septa

Serrated silicone rubber septa bottom O.D. 19.5 mm, fits neck I.D., 17.5 mm, ST/NS: 19/22