lab shell vials with clear polyethylene closure Fisherbrand 2mL Titeseal Clear Autosampler Shell Vials with White Polyethylene Plug Style Needle Closures. Closures are not attached. Economic alternative to aluminum seal, crimp/snap-ring, and screw thread finishes. Shell vials are made from Type 1, Class A, KG-33 borosilicate glass. Capacity: 2mL.