Septa Only - Rubber and PTFE septa without caps which are sold separately. Septa Types: Aluminum Foil, Black Rubber, Blue Silicone Rubber, Butyl Rubber/PTFE, Dark Grey Rubber, Grey Rubber, Low Bleed types for GCMS, Molded Rubber (Pharmafix), Natural Rubber, Orange Rubber, Pre-Slit, Red Rubber, Silicone/PTFE septa, Translucent Rubber, White Silicone Rubber.