hplc vial inserts with flat bottom with patch from Sigma hplc vial inserts price® AUTOSAMPLER VIALS,INSERTS,AND CLOSURES. 8-425 Screw Thread Vial Clear 2 x 32 Flat Bottom 2.0 mL 1.8 mL . 170 66020-950 100 1000 2mL,12x32mm,9mm Wide Opening Screw Thread Vials and Inserts • Write-on patch with graduation for convenient sample identifiion • Wide neck opening •