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. Shop Thermo Scientific™ 13mm Thermo Scientific™ 13mm Autosampler Vial Septa PTFE/Silicone, 60mil thick Thermo Scientific™ 13mm Autosampler Vial Septa | Fisher Scientific