1.20mm Headspace Crimp Vials ND20 20mm Headspace Crimp Vials are often used in Shimadzu, Spectral Physics, Varian, and other autosamplers. 2.20mm Crimp-top Aluminum Caps with Septa 20mm crimp top septa is used PTFE and high-quality silicone rubber or ultra-pure silica as raw materials, the gasket is guaranteed to be non-toxic.