Introducing the Plasticoid VWR Black Rubber Stoppers, designed for versatility and reliability in laboratory settings. This pack includes one-hole stoppers, ideal for securing flasks and test tubes while allowing for the insertion of a thermometer or other apparatus. Made from durable black rubber, these stoppers provide an airtight seal, preventing contamination and evaporation of your samples. Their flexible design ensures a snug fit across various glassware sizes. Perfect for chemists, biologists, and educators, these stoppers are essential for any lab environment. Stock up and ensure your experiments run smoothly!
