A6420102091 Crankcase Ventilation Breather Valves Fit For W203 Replacement Part. Product general part number: A6420102091, 6420102091, A6420102191, 6420102191 Engineered with quality ABS, the Crankcase Ventilation valves efficiently separates oil vapors from crankcase gas, reducing carbon buildup and extending engine service life for various models. 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