Thermo Scientific™ 13mm Autosampler Vial Septa. 13mm Septa for use with threaded caps Snap/Crimp Caps are available in PTFE/ Red Rubber, PTFE/Silicone or Red PTFE/White Silicone/Red PTFE. Pricing and Availability. Thermo Scientific™ Shell Vials. Shell vials are an economical choice for many routine HPLC