for my 82 300cd

time to start thinking about ac again. I have read the manifold pair of hoses on the ac compressor are not supposed to be flushed. I flushed them the last time but had a shrader valve leak and the system went down pretty fast. I want to make another try at it this year and Im wondering if this tube is indeed not flushable, I never had a catostrophic failure either time, just leaks. Is there a source for this hose set? The others are pretty straight forward but this one looks special and I cant find it in the buy parts section

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1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)