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Amazon.com: QORPAK - 9mm Red pre-Assembled PP Hole Cap PTFE/Silicone Se PTA, CS1000 : Industrial & Scientific
Autosampler Vials Cap,9mm Blue Polypropylene Screw-Thread Caps with PTFE Red/Silicone White Septa by Biomed Scientific: Amazon.com: Industrial & Scientific
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Wheaton W240830 White Polypropylene Screw Cap with Bonded PTFE Faced Silicone Liner, 13-425 Size (Case of 250): Science Lab Cap Plugs: Amazon.com: Industrial & Scientific
Biomed Scientific Syringe Filters PTFE Membrane 25mm Diameter 0.22um Pore Size Non Sterile Pack of 10: Amazon.com: Industrial & Scientific
PP Screw Cap Without Hole (Black) for 15-425 Screw Neck, Septa Silicone Rubber/PTFE, pk.100: Amazon.com: Industrial & Scientific