Vented Engine Motor Breather Canister Crankcase Head Gearbox Oil Collector Fit For Harley Custom Aluminum. Replace Part Number: 40-0457 Crankcase Breather Oil Separator Effectively separates oil from the crankcase gases to ensure clean engine User-friendly design allows Compatible With straightforward installation without specialized tools. Crafted from high-strength plastic, this Oil Separator Segregator boasts resistance to corrosion, wear, high temperatures, and rust, along with dependable quality and outstanding performance. Serving as a fuel pretreatment component, the cylinder oil separator breather valve efficiently eliminates water and contaminants from fuel, stopping these substances from corroding and abrading fuel system and engine parts., Manufacturer: ZTAWWCJ