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Introducing the Plasticoid VWR Black Rubber Stoppers, designed for versatility and reliability in your laboratory needs. This pack features two-hole stoppers, perfect for secure sealing of flasks and bottles while allowing for the insertion of tubes or probes. Made from durable black rubber, these stoppers provide excellent chemical resistance and a snug fit, ensuring minimal leakage. Ideal for various applications, they are essential for any lab setup. Whether you're conducting experiments or storing samples, these stoppers are a practical choice for maintaining integrity in your work.