I'm modernizing my 1980 W116 300SD's air conditioning and am replacing all hoses. Except maybe this small one. You see, it will still bolt up as-is and I see no need to change it--except it may not be a "barrier" hose, therefore not compatible with R134a (because the molecules are smaller and may leak through the hose over time).

What do you think? I'll replace the hose if I have to, and don't want to cheapen out, but is it wasted effort and money to replace this hose? I also wonder if I can purchase new hose that is thin enough to fit on the old fitting, anyway. It's the thinnest one that goes to the drier.

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles