This seems like an extension of pipe relining: https://www.youtube.com/watch?v=n7hi-0jMnEI https://www.youtube.com/watch?v=n7hi-0jMnEI (Which in itself is prett

This seems like an extension of pipe relining: https://www.youtube.com/watch?v=n7hi-0jMnEI https://www.youtube.com/watch?v=n7hi-0jMnEI (Which in itself is pretty neat solution to a problem)