2 ml vial caps manufacturer Best SellersBest Lab Autosampler Vials. Autosampler Vial 2ml with Caps, HPLC Vial,9-425 Aer Vial with Blue Screw Caps,Writing Patch,Graduation,White PTFE & Red Silicone Septa Fit for LC Sampler(200 pcs,Brown) 4.5 out of 5 stars 7. $35.99 #9.