screw neck HPLC sample vials white graduation line. Vials and caps - Labicom.czGC and HPLC autosampler vials with screw neck N 8, N 9, Storage vials for powdery samples (snap cap vials N 18 and Silicone white / PTFE red.PYREX . lids HPLC glass vials screw neck-HPLC Sample Vials