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. Constructed with high-strength plastic, this Oil Separator Segregator is resistant to corrosion, abrasion, extreme heat, and rust, delivering consistent quality and excellent operational performance. The cylinder oil separator breather valve functions as a fuel pre-processing device, efficiently removing water and foreign particles from fuel and protecting the fuel system and engine components from corrosion and wear induced by these contaminants., Manufacturer: KVSWBRE