470002 and 470451 are filter elements used in dual-fuel ship engines. These filters are usually used together or simultaneously, and are employed for the precise filtration of the fuel, oil, or hydraulic systems of this type of engine.

470002 Primary coarse filtration: removes large particles, sediment, and rust from fuel, thereby protecting the downstream fine filtration elements.
470451 Secondary fine filtration: eliminates tiny solid particles in fuel, which helps to protect high-pressure fuel pumps and fuel injectors.

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