Autosampler Vial Caps and Closures. MicroLiter EZ-Decappers™ Hand Operated Cappers and Decappers by MicroLiter are easy-to-use tools for crimping and decrimping chromatography vial closures. 11mm Wide Opening Snap-It Caps and Septa are easy to apply and easy to remove and fully compatible with all Snap-It vials.