It can be hard to install those, even when reinstalling an existing hose with a new sealing ring.

Try putting it in hot water first to soften it so it is more pliable, or use a heat gun, and apply a little penetrating oil to lubricate it.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22