Good to hear you got it working. Mine is just 3" and I cut a slot in the bottom of the pipe and capped the end. I tied a rope to it so I could pull it back and forth over the muck. Worked pretty good until I took an extended break got covered with muck and it sealed up and I could not move it. Finally got it dug out so if we get enough rain to fill this winter I can get back at it. It's amazing that it can seal up a pipe but a pond still leaks through it