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The 400 series and 600 series filter heads from Racor use the same filter element. The difference between the two is the primer pump, which is included in the 400 series. If you decide to go with Racor, I would suggest you use the 600 series head. You pay a penalty for the primer in the form of an additional 1.0 inHg in pressure drop across the filter housing (400 series). The specs are contained in the PDF links below.

400 Series Specs


600 Series Specs

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