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Red filter is .125" for full flow journal bearing turbos.
The filter is made with female 4AN at the inlet side and male 4AN at the outlet side. This allows the filter to install into virtually any 4AN line without additional fittings. The FP4ANFilter features a 10 micron replaceable filter element that captures oil contaminants in its basket. The filter basket is easily removable for quick inspection and cleaning. The filter can be run in either direction, but the preffered flow direction is in the female side and out the male side. This allows all the contaminants to be collected inside the filter basket rather than collecting the contaminants all over the outside of the filter basket.
1 month of use, then decided to run another turbo and setup. Asking $50 shipped and paypaled.