HiKOKI 6690365 Cleaner Sponge for a wide range of compatible Hitachi and HiKOKI petrol-powered garden and engine tools. This replacement foam air filter element helps trap dust, grass and debris before it enters the carburettor and engine, helping maintain clean airflow and reliable engine performance. Suitable for replacing a dirty, worn or damaged original filter and manufactured to the correct specifications for precise fit. Part 6690365 replaces the previous part number 446-0652N-20.