What is this tube sticking out of my roof?

I'm not sure what kind of vent this is for, but I'm wondering if its supposed to have a cap to protect from rain.
Sorry for lack of description. I'm completely ignorant to whatever this is.
If it helps at all, I have two turbines on my house plus this pipe. So I know it's not for venting the attic. My guess is its for the bathroom vents maybe?
Question from user hack3rfx at stackexchange
Answer:
Almost certainly a vent for plumbing. It connects to the sewer, so it doesn't need a cap. It's highly likely there's a sink or other fixture nearly below it.
Answer from user Aloysius Defenestrate at .stackexchange.com.

I'm not sure what kind of vent this is for, but I'm wondering if its supposed to have a cap to protect from rain.
Sorry for lack of description. I'm completely ignorant to whatever this is.
If it helps at all, I have two turbines on my house plus this pipe. So I know it's not for venting the attic. My guess is its for the bathroom vents maybe?
Question from user hack3rfx at stackexchange
Answer:
Almost certainly a vent for plumbing. It connects to the sewer, so it doesn't need a cap. It's highly likely there's a sink or other fixture nearly below it.
Answer from user Aloysius Defenestrate at .stackexchange.com.

