Ok, sorry to highjack this a bit, but I am curious about this S trap.
My tub seems to be on this type of setup. It drains into a P trap, but in order to go around some obstacles an S trap occurred. The obstacles are now gone and it wouldn't be real hard to change from the S, but it seems to work and the trap, which has a cleanout, seems to hold water. Should I change it?? I have everything I need as I am doing some other plumbing connections.
I have attached a drawing in hopes of showing exactly what I have. If need be, I can supply a picture later.
The vent and main line are 4", the tub drain is 2" and is the only item draining into this vent. The tub drains quickly, but does have a gurgle as it's draining. Not sure if the gurgle is normal or not, it comes from the overflow tube. My last house had the gurgle, but I don't doubt it had vent issues.
Thanks for the help and sorry for the highjack....