Hi kamo--The transparent flexible-ish pipes you saw were 5/8" ID plastic that you can buy in any big box, or hardware. Just cut out the bad copper in your A/S, slide the plastic over the copper, and secure with a stainless steel screw clamp. I have used this method for all rework, and it has been leakfree for 18 years. Unlike the high water pressure in your home, the pressure in your A/S is about 45 psi, so the plastic with clamps works just fine. Worked for me.--Frank S
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