Racor Diesel Spin on series Replacement Element (30 micron red cap) .
The lower the micron rating, the finer the filtration. Lower micron ratings should be considered when there is no additional downstream filtration.
Follow your engines manufacturer's recommendation for fuel filter micron rating.
For Racor Filter Head/Model:4120R/6120R
S = Secondary/final 2 micron (brown cap)
T = Primary or secondary/final 10 micron (blue cap)
P = Primary 30 micron (red cap)

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