Spectra Premium Spectra Fuel Filler Neck FN811 Unit is designed to Original Equipment (OE) fit, form, and function requirements Unit is dual coated for enhanced corrosion protection Fit tested on vehicle application for which it was developed, verifying the design fits properly Unit is leak tested after production to ensure product is free from fuel and/or evaporative leaks Tested with OE fuel cap to prevent EVAP and check engine light failure