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AIR FILTER, SAFETY OBROUND, Donaldson PN: P621984

Safety filters have two functions: to act as a backup to the primary filter and to protect the engine during primary filter servicing.

• Serve as a backup filter in case of primary filter damage or improper installation.

• Prevent contaminants from entering the clean side of the air intake system during primary filter servicing.

• Designed to plug rapidly if contamination finds its way past the primary filter, alerting operators about an issue.

• Recommend that safety filters are replaced with every third primary filter change unless there has been a failure of the primary filter.

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ENGINE AIR FILTER, Caterpillar 420-1781

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