Snap Ring™ /Crimp Top Vials - 12 x 32 J.G. Finneran use of Snap Top Caps™, patented Poly Crimp™ Seals or standard aluminum seals. Snap Ring finish eliminates the need for crimping or decapping. Designed to work in Aijiren (hp) and other autosamplers. Unique StepVial design precisely centers a limited volume insert in the neck of the vial.