18mm Screw Thread Metal Cap for GC Vials
Vials with septa-capped 18mm caps are used as sample vials, and these vials can also be used as storage bottles. Precision-machined threads always ensure sealing. It fits perfectly with the matching 18mm magnetic metal screw cap and PTFE/silicone septum. The caliber of this series of headspace bottles is 18mm, and the size of 20ml is 22.5*75.5mm.