Autosampler Caps – Aluminum, Crimp Top with PTFE-Lined ButylRubber Septa for 11-mm Vials, Pkg 100. Autosampler Caps – Aluminum, Crimp Top. Vials and Closures Catalog 2014-2015 – Fisher Scientific. Perfect alignment of the vial and cap surfaces means fewer mishandled vials leading to Aluminum Crimp Seals with Prefitted Septa for 8mm Crimp