I have a 4' section of 4" copper drain line that is a heat exchanger with coils of tubing around it to recover heat from drain water. It was available commercially when I installed it about 15 years ago. It's in a house and the rest of drains are PVC. It's in a vertical stack and coupled with fernco style rubber couplers on the ends. Just discovered I have a leak and found about a 1/16" x 1/8" hole clear through near the top of it and a vertical crack running through the hole. When I...
Copper drain line eaten away...
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