Fuel Injector Seal Remover Installer Tool for BMWFeatures: This seal removal tool installer helps the operator to properly install the Teflon seal (or ring) onto the BMW injector before reinstalling the injector onto the cylinder head. Two different methods of shrinking the Teflon seal, depending on the engine code reference and the type of injector fitted. High quality Materials Teflon sealing material expands when installed into the injector bore, resulting in an effective seal. High Quality