I've got an old pool, I'm pretty sure was built early 60's. The skimmer is a sump type with a single black line going to my pump. The only joints are at the pump where it goes from the black pipe to the white PVC. As you can see I broke up my concrete because the line was sucking air. I thought I'd find an old copper line but was surprised to see this black pipe. I found the leak, it's an old repair under a small slab on the side of the house that probably happened when prepping for the the concrete (about 20 years ago). I figure since I've broken up the entire deck I might as well replace as much as the line as possible, but unfortunately I cannot go into the skimmer because the pipe is encased, so I plan to cut it just beyond the skimmer and find a way to connect PVC. Any suggestions?