Screw caps for autosampler waste and wash vials. Supplier: PERKIN ELMER GC-INSTRUMENTS. Description: N/A, Chromatography vial closure, PTFE/silicone, Ø: 13 mm, Screw cap, 1000 per pack, Septum: PTFE/silicone (Ultra Low Bleed) ,PERCN9304142EA,PERC09923032EA,PERCN9304141EA.