RaceFlux -4AN Male to 3/8"-16 Male Crankcase Breather Adapter Fitting, for Harley Davidson Engines

Vent a Harley crankcase into AN plumbing: this adapter threads into the 3/8"-16 crankcase breather bolt hole on Harley-Davidson engines and presents a male -4AN flare, so head breathers can route through braided line to a catch can instead of dumping vapor onto the air cleaner.

Key Features

• -4AN male flare to 3/8"-16 male thread crankcase breather adapter
• Routes Harley head breathers into AN line and catch can plumbing
• Reusable

Fitment & Compatibility

• Fits Harley-Davidson engines with 3/8"-16 breather bolt holes — verify your model's breather hardware before ordering
• Common uses: routing breathers to a catch can, cleaning up air cleaner oil residue on high-mileage and performance builds