Septa, PTFE-Faced Silicone Rubber, 0.005" PTFE, 0.06" Silicon Rubber Thickness, Fits 13 mm Caps, For Use With Open-top Caps, All Autosamplers Using Screw Thread Vials, Autoclavable, Resists Coring. View All 6 Choices. View All 6 Choices. Expand to Compare / View All Choices / View item Details / Add to My Favorites.