It always best practice to replace rubber return lines during any major system disassembly. These hoses often get brittle and have a tendency to wear on high mileage vehicles. Although the exterior of the hose may look fine its not uncommon to see degradation on the interior of the hose. We see lots of these hoses get damaged during service or during performance upgrades.
This is an actual OE PASSENGER SIDE injector return line.
2011-2016 Duramax 6.6L LML LGH
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