✔ Universal Compatibility: designed to fit 14/23, 19/26, 24/29, 29/32 outer joint laboratory glassware, these stoppers ensure a secure seal for volumetric flasks and separatory funnels. 

✔ Premium Construction: crafted from premium plastic, these stoppers boast excellent resistance to both acids and alkalis, enhancing longevity and durability in various laboratory conditions. ✔ Convenient and User-Friendly: with their lightweight and flexible design, CS Labglass plastic stoppers are not only easy to handle and apply but also simple to transport and store.