It is recommended to change out return lines when replacing injectors. Return lines tend to get brittle and break very easily upon removal.
NOTE PLEASE: Apply some lubricating oil to the O-rings on ends of the new fittings for a smooth & damage-free installation.
Compatibility: 2004-2010 Ch-evrolet Silverado 2500 HD (V8 403 6.6L (6599cc), 2007-2007 Ch-evrolet Silverado 2500 HD Classic (V8 403 6.6L (6599cc), 2004-2006 Ch-evrolet Silverado 3500 (V8 403 6.6L (6599cc), 2007-2010 Ch-evrolet Silverado 3500 HD (V8 403 6.6L (6599cc), 2007-2007 Ch-evrolet Silverado 3500 Classic (V8 403 6.6L (6599cc), 2004-2007 Ch-evrolet C4500 (V8 403 6.6L (6599cc), 2004-2007 Ch-evrolet C5500 Kodiak (V8 403 6.6L (6599cc),
Left Fuel Injector Return Line sold separately Pt # 0928402097
