Material: Silicon Rubber or Natural Rubber. This Septa has a hollow plug, which has a series of rings on the outside to tightly grip the inner wall of the glass joint and form an air-tight seal. The upper sleeve folds down over the neck of the glass joint. The Septa can be pierced repeatedly with a needle.
Sizes available: B-14, B-19, B-24, B-29, B-34.
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