In a townhouse n'hood near mine, many of the houses have a pipe coming out of the wall, and I wonder what it is.
It's a white plastic 4" right angle pipe connector that comes out about 4 inches** and then turns to point down. Nothing is connected at that point. It's at the same level as the garden faucet so I guess it comes out of the ceiling of the basement.
**It only comes out as far as the right-angle piece puts it. There is no other pipe showing.Some rows of homes have this, but others don't. The ones built maybe around 1997 have them, and the ones built 2 or 3 years later don't. (There are some others that don't that I thought were also built the same year as the first group, but if the construction year determines if there is a pipe or not, maybe I'm wrong.)
I've met a couple of the people who live there, but the odds one of them knows what the pipe is for seem slim to me.