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Simport T504AQX Polypropylene Septum Screw Cap for Sample 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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Assembled screw cap with hole with PTFE/silicone septum black polypropylene hole cap, thread for 18-400, PTFE/silicone, septum thickness 1.5 mm, for use with 15 mL vial, pkg of 100 ea | Sigma-Aldrich
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