6.0 Blue Spring Kit Upgrade Powerstroke Fuel Pressure Regulator Kit Compatible with 2003 2004 2005 2006 2007 F250, F350, F450, F550 Replaces # 3C3Z-9T517-AG 3C3Z9T517AG. Function: This 6.0 Blue Spring upgrade kit can help prevent low fuel pressure that may lead to injector failure.
