0501218540 Breather, compatible with ZF 12-speed and 16-speed gearboxes. It balances internal and external air pressure of the gearbox to avoid abnormal pressure caused by temperature difference and operation, preventing box expansion and oil seepage. The built-in multi-stage dustproof structure stops dust and moisture from entering and avoids oil deterioration. Compact and easy to install, it features solid structure against falling off, vibration and aging. It maintains stable internal environment of the gearbox and reduces failure risks.