I thought about it, but I'm not a plumber by any means though. There's 3 clean out caps all within a foot of each other, all of them have brass caps that appear to have never been removed. One of them stands up past the floor a couple inches, the other two are flush. And one of the flush ones has a wall plate covering half of it from whatever idiot finished the basement. I got the cap off the pipe that's higher than the floor & it's bone dry inside. The brass square topper sheared off, so it was really fun to get it off. I haven't messed with the other two.