11727540466 11721744255 Air Pump Injection Control Valve for BMW 323I 323IS 328I 328IS M3 Z3 Air Injection Check Valve

• How does a check valve work? A car's check valve is like a "one-way switch": When fluid (air/exhaust gas) flows forward, the pressure pushes open the internal valve flap/reed, letting the fluid pass through smoothly. Once the fluid tries to flow in reverse, the reverse pressure shoves the valve flap back to its sealing position, and the valve closes automatically to block the backflow — this prevents equipment damage, pressure surges, or exhaust gas abnormalities. Features  •   Automatic on-off, One-way conduction ,High adaptability Benefits  •   Reduce the risk of damage to pipelines/engine components •   No complex electrical control components and low failure rate •   Aid in optimizing engine exhaust/intake efficiency  • O.E.M Replace: 11727540466/11721744255 Compatible Vehicles: Make Model Year Engine BMW 3 Coupe 1995.05-1999.04 323 i (125KW,170PS) BMW 3 Touring 1995.12-1999.04 323 i (125KW,170PS) BMW 3 1995.10-1998.01 M3 3.2 (236KW,321PS) BMW 3 Coupe 1995.10-1998.1…