I've never replaced my return lines. I keep waiting for them to leak. But, so far, dry as a bone. I have other things to do other than fix something that ain't broke, as P E H said. Because of the age of the car, I have 2 feet of hose ready to go, however.

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Paul 1987 300 SDL; 2000 ML; '69 MGB; '68 VW Fastback