DPRK KPA Woodland Leaf Camouflage Kepi and Cap Badge Verus Engineering Washer Fluid Cap. Remove the lackluster plastic cap that come on your factory BMW M2, M3, and M4 with a cap machined from solid aluminum. The caps are offered in three common colors to add color to the engine bay. The units install easily within minutes with no tools required. The washer cap is machined in house on our 5 axis CNC mills, produced in the United States of America. Anodized parts can potentially fade over time due to engine bay heat.