Injector Ferrule for D-Torch. ONLY compatible with Glass Expansion D-Torches for Thermo PRO Duo, PRO Radial, 6000/7000 Duo & Radial Series ICP-OES. The injector ferrule is a consumable part that needs to be replaced on average about every 6 months. Replacing the injector ferrule on a routine basis ensures a proper injector seal. Use Injector Ferrule Tool – 6.5mm (70-803-0915) to facilitate the removal and installation of the injector ferrule.Glass Expansion is ISO 9001:2015 certified by AB Certification, No. AU4501-9001