Drive with confidence knowing that your 2003-2004 6.0 Powerstroke is equipped with the best in performance and reliability. The Ford Motorcraft ZD-31 Glow Plug provides the reliable direct-fit replacement you need to keep your engine running at peak efficiency. Crafted out of only the finest materials, this genuine Ford part ensures maximum power while reducing stress on other components. Delivering 22mm of long life ignition every time, enjoy a smooth operating experience no matter where you go. With quality engineering and construction that you can trust, make sure to equip your Powerstroke with an unbeatable glow plug from Ford's Motorcraft brand.