washing protocols evaporation-proof seal autosampler vials Convenience packs with 2.0mL, 12 x 32mm clear vials • I-D vials have marking spots and graduations (0.5, 1.0 and 1.5mL) • Proper fit assured - caps and Aluminum Crimp Seals with Prefitted Septa for 12 x 32mm Vials. Aluminum . Waters Certified Sample Vials White Paper.