Caps for 9mm - 2ml Screw Neck Vials Friction. Friction. Bonded Pre - Slit. Screw / Silicone / PTFE. * Top - Closed. Vials 20mm Headspace GC Vials. 2ml PP Screw Top HPLC Vial - aijiren. Zhejiang aijiren can also provide Autosampler Vials, Caps, Septa, Storage Vials, Syringe filter. Hot Tags: 2ml pp screw top hplc vial, China, manufacturers,