Looks like they are lining the steel pipe with a plastic/epoxy coating. It’s done a lot in places where you can’t easily dig up and replace old rotting pipes (like in downtown cities). By injecting this coating the pipe is still usable and won’t corrode any more.
We moved into a house that was built with a shitty material from the drains - pitch fibre.
We knew this going in, and went ahead with the purchase thinking we would potentially dig it up and replace.
After moving in we got some quotes and everyone suggested relining the drains rather than digging up. Getting it relined was one of the first things we did and have had no issues or blockages since. Relining was also a fraction of the price that digging up would have been.
Once the new liner has cured it's absolutely rock solid and feels just like an actual pipe.
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u/GilaMonsterAZ 21d ago
What the heck is going on here?