Headspace Crimp Neck Vial (ND20) Porefil® Crimp Neck ND20 For the analysis of volatile organic solids and liquid samples after gasification. E Compatible ND20 Crimp Cap ND20 Bi-metalic & MagneticND20 Aluminium crimp cap PRF.C0203.023 Open top magnetic, 10mm hole PTFE Silicone, 3.0mm septa