Parks
wort jockey
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This explanation doesn't seem right to me. Tubes to be used for refrigeration must comply with AS/NZS 1571. This standard specifies requirements for round, seamless copper tubes manufactured from phosphorus-deoxidized copper containing high residual phosphorus (UNS alloy C12200). Requirements including chemical composition, hardness, grain size and manufacturing tolerances are specified.
I doubt mild steel with a thin copper inner tube is used.
The explanation does make some degree of sense, even if the standards dictate otherwise.
Would love to know if anyone has actually cut their freezer apart to find the actual cause of the leak.