This -6 AN Male to 10mm Metric (straight thread) fitting is designed specifically for the Holley (Walbro) Inline Fuel Pumps. Don't buy either the Holley 12-930 190 LPH or the Holley 12-927 255 LPH fuel pump and think you will find this at the hardware store. Because it is a straight thread (as opposed to a tapered pipe thread) this fitting requires a copper washer to seal against the fuel pump.
5 - This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.