02-06 Nissan Altima 3" Air Bypass Valve for Cold Air Intakes RED Inlet/Outlet size: 3" (76mm), Red Element. Please refer tot the picture for bypass valve overall size. Virtually eliminates chance of intake system ingesting water if filter becomes submerged Installs along upper portion of cold air intake systems with minor modifications (cutting might be required, depends on application) Vehicle Application: 2002 2003 2004 2005 2006 Nissan Altima REMARK: The Air Bypass Valve is NOT for use on forced induction vehicles.