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07-0075R 8 mm snap cap, natural, with precut PTFE/silicone septum, EVA, 100 pc/PAK | analytics-shop.com
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Assembled screw cap with hole with PTFE/silicone septum black polypropylene hole cap, thread for 13-425, PTFE/silicone, septum thickness 1.5 mm, for use with 4 mL vial, pkg of 100 ea | Sigma-Aldrich
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Simport T347AQX Polypropylene Septum Screw Cap for Microcentrifuge Tube (Pack of 250): Science Lab Cap Plugs: Amazon.com: Industrial & Scientific
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CG-4910 - SCREW CAPS, OPEN TOP, WITH PTFE FACED SILICONE SEPTA, LAB-PAC, SEPTUM- Chemglass Life Sciences
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