I have a nature's comfort 250 owb, about 70 feet from my home. I buried the 4'' black solid congrated pipe about 3 feet deep. Not sure what brand of pipe i have. Inside the 4'' pipe is two 1'' pex pipe wrapped in silver insulation. Anyways christmas eve my basement was flooded with water coming from the 4'' pipe that comes through the basement wall. I thought maybe one of my 1'' lines had a leak but, the water level was fine in owb. So, i am guessing that there is a hole in the black pipe some where allowing water to drain into my basement. So, i have decided to dig pipe back up and fix it. Which way do you guys think may be best to fix it.