Red, 12 x 32 mm Screw Neck Cap and Preslit PTFE/Silicone Septum, 100/pk - 186002128 | Waters
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
Blue Cap / Chlorobutyl Septa | qecusa.com
TPE Septum Caps for Sample Tubes | Azenta Life Sciences
Autosampler Vials Cap,9mm Blue Polypropylene Screw-Thread Caps with PTFE Red/Silicone White Septa by Biomed Scientific: Amazon.com: Industrial & Scientific