HiKOKI 6690352 Cleaner Element 6T for compatible Hitachi and HiKOKI petrol brush cutters and grass trimmers. This replacement air filter element helps prevent dust, dirt and debris from entering the engine through the air intake, helping maintain reliable engine performance. Suitable for replacing a dirty, worn or damaged original filter and manufactured to the correct specifications for precise fit. Part 6690352 replaces previous part numbers 446-01380-21 and 790191.