13mm Chlorobutyl Rubber Stoppers (2-Prong, Grey) - 1,000 Count These pharmaceutical-grade stoppers deliver reliable vial sealing for high-volume laboratory and medical applications. Manufactured from high-purity Chlorobutyl Rubber, they provide superior resistance to heat, chemicals, and gas permeability—critical for maintaining product integrity and sterility. The two-prong design ensures secure positioning and consistent performance across thousands of vials. Ideal for vaccine storage, injectable medications, and diagnostic sample preservation. Each bulk pack of 1,000 units offers cost-effective solutions for facilities requiring dependable, compliant closure systems that meet stringent pharmaceutical standards.