BMW OEM Manual Transmission Radiator Coolant Adjustment Screw M/T Drain Plug E46 320i 323Ci 323i 325Ci 325i 325xi 328Ci 328i 330Ci 330i 330xi X3 2.5i X3 3.0i X3 3.0si Z4 2.5i 3.0i 3.0si Z4 Radiator Adjustment Screw with Drain Plug - Coolant Flow Adjustment Manufacturer Warranty: 12 months or 12000 miles Please see Product Description Below for Vehicle Compatibility