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) 14/20 Joint Size:14/20 Joint Ideal Electrical 61-337 Auto Range

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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) 14/20 Joint Size:14/20 Joint Ideal Electrical 61-337 Auto Rangestonylab 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) Product Features Suitable for sealing lab glassware with 14 20 outer joints in Lab experiments Lightweight hollow glass stopper ensures a tight seal Hexagonal head design allows easy handling, cleaning, and prevents slippage Made of durable glass, reusable; maximum withstand