I’m sure there is a really simple answer to this but I’ve never seen this setup before. It’s right next to where the main drain exits the home at the front. It extends up and out of the ground then goes right back down. That vent looking pipe comes up separately, it’s not attached to the other above ground.
I am in central SC and there is no gas to this home.
Haven’t had any luck trying to search for an answer. Thanks in advance.