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This Closure 8-425mm Screw On PP Black PK1000 from Qorpak is an essential laboratory supply for closing containers securely during experiments or storage. The screw-on design ensures a tight seal, while the unlined polypropylene construction guarantees chemical resistance and durability. The convenient 8-425mm size fits various labware types and applications, making it perfect for life science research, pharmaceutical testing, or educational institutions. Enhance your laboratory workflow with this high-quality, American-made closure from a Veteran-Owned Business - Qorpak!