This isthe water separatordrain plug upgrade for the HFCM (Horizontal Fuel Conditioning Module) onall 2003 to 2007 F-Series6.0 Power Stroke Diesel applications. This is new andOEM from Ford.The plug uses a 6mm allen hex and knurledat the outergrip area of the plug. It uses the long retainer to keep itself from being dropped. This alsohelps the drainingprocess by keeping the water and fuelfromdraining onto the front driveshaft on 4 x 4 models. It does come with a new o-ring also.2003-2007 F-250, F-350, F-450, F-550 Super Duty trucks with6.0 PS Turbo DieselFREE SHIPPINGto anywhere in the United States via USPS. For shipping charges elsewhere, please email me. If you win multiple products or make purchases in my eCRATER store, I will combine shipments to save shipping charges. If you need any other Motorcraft filters let me know, I stock the complete line. Check my store. Email me if any questions.