Crimp caps Analytical Vials - Sigma-Aldrich. We offer a wide selection of autosampler and general-purpose vials, for optimum performance in HPLC, GC/MS, LC/MS, and high-throughput analysis. Vials and caps - Separations. GC and HPLC autosampler vials with screw neck N 8, N 9,. N 10 and N 13, crimp neck N 8 and N 11 as well as snap ring vials N 11.