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. Made of robust high-strength plastic, the Oil Separator Segregator features anti-corrosion, anti-wear, high-temperature tolerance, and rust-proof properties, ensuring reliable quality and superior functionality. Designed for fuel pre-treatment, the cylinder oil separator breather valve effectively gets rid of water and impurities in fuel, preventing corrosion and wear to the fuel system and engine components caused by these elements., Manufacturer: HAYSXVR