Post #388528 by MadDogMike on Sat, Jun 21, 2008 9:51 AM

My concrete pipe has cracked some but that alright. The earth surrounding the pipe still seals it airtight. It doesn't need to be water tight or anything, the pipe is mostly to line the hole and keep the walls from caving in. It probably helps that the pipe I used was not freshly cast, it had been sitting around for probably 40 years and was as dry as it was going to get.