Apologies if this is the wrong forum to post this question. Our house has a vent pipe in the basement coming off the main stack (water line going to sewer).
I understand there is a pressure difference created during a flow (from flush or sink water) but why is the vent in the basement? Or is there one on the roof as well? Should I be concerned there will be runoff or splash-back in the basement in case the pipe is blocked?
The flexible tube sticking with the cap was recently added because of some splash back that occurred due to a blockage at the bottom junction. I'll let you know the model of the cap but I believe it is something similar to a plastic version of a Gizmo vent cap. I'll edit when I know the exact model. Since this installation, I haven't noticed any more runoff coming out.