stonylab Glass Hex Head Hollow Stopper, Hexagonal Glass Stopper for 14/20 Outer Joint with Closed Bottom, Ideal for Sealing Lab Glassware, for Laboratory Use Only (5 Packs)
Hexagon Head Stopper; convenient to clean and rotate, and side grooves can prevent slippage
Borosilicate Glass; heavy duty design; reusable and High quality
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