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Wheaton Science Products 242768 Black Polypropylene Cap, PTFE/Silicone Liner, 13-425 mm Size (Pack of 100)

Wheaton Science Products W238520-1800 White Polypropylene Screw Cap with PTFE/Foamed Polyethylene Liner, 18-400 Cap Size, 27.94 mm Length (Pack of 200)

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Wheaton Science Products 242760 Black Polypropylene Cap with PTFE Red Rubber Septa, 10-425 Cap Size (Case of 100)