I'm wanting to put a new bathroom in our basement with a tub, toilet, and sink. There's a picture attached of the rough-in put in when the house was built. I'm trying to figure out what pipe will go to what fixture and how it will all be vented. As a test, I popped off the caps and poured water into each pipe. The smaller pipe on the left side of the photo has a trap in it (water was visible in it). The other two on the right drained (no water visible). I'm assuming the pipe on the left side is for the tub, and the larger pipe in the middle is the toilet. But I'm not sure about the smaller pipe on the right. Can I drain the sink into that pipe???
1) Is the small pipe on the right the vent for both the shower and toilet?
2) Can I drain the sink waste into that pipe on the right???
The other picture is a pipe going to the second floor. Someone wrote "vent" on the joist. I'm assuming I hook on to this guy and run it over to the rough-ins to provide venting.
Currently, I'm planing on droping down vents to that pipe on the right and another vent down to the new sink. The sink's waste would be hooked to that pipe on the right.
Please let me know what you think, and what configuration I need.
If that pipe on the right is a vent and I ran the sink drain to it, does that make it a "wet vent" for the tub/toilet?
3) Should I drop down a vent pipe for the tub pipe on the left?
4) If I use the pipe on the right for the sink drain, is it then considered a "wet vent" for the toilet/tub, and is that ok?