flame arrester plate, for KCA and KCE nozzle holders.
This flame arrester plate is essentially required when changing the injector nozzles. It protects the nozzle from the combustion heat.
The flame arrester plate with a small hole is typically used at Volkswagen, etc.
In Mercedes cars the flame arrester plates come with a bigger hole (7.6 mm) which results in a non-optimal heat protection. Therefore, we recommend the fss-uni for Mercedes vehicles too.