Hi all,
This is my first post, so I apologize in advance if I've put this in the wrong section or messed up any technical terms.
I'm redoing my dining room and had the ceiling torn down, and so decided to do the plumbing for an upstairs bathroom above said dining room. The bathtub has a drum trap I was going to replace with a P-trap (not a big issue) but there's a vent pipe connecting just after the drum trap that I'm wondering on the status of. Should it be removed, or should I just tie it in after the P-trap with a wye? The 3" stack for this line is about 6' away if that makes any difference.
[i.imgur.com]
Following along the same drain the tub (and lav sinks) empty into this 3" elbow with a 1.5" drop on the side directly under the commode, and I'm suspecting that's not allowed. I think these are used more for venting, and not much for flushing sewage accidentally into your tub drain. Can/should I rebuild this section to include a 3x3x1.5" wye (or sanitary tee) after the elbow from the commode?
[i.imgur.com]

Thanks in advance for any advice you can share.
-C

**Edit - updated image links 7/27 (thanks Steve!)

Your first pic link doesn't work. The vent for the drum trap needs to be connected to the outlet piping from the P- trap. I'm not sure, based on your description, of what the connection is at the toilet, but maybe the toilet is wet vented by the tub drain/vent?

Thanks, Steve! I updated the image links, thank you for catching that. New images should be illustrative.

Any ideas or help to be offered on the commode draining picture?
Thanks everyone,
-C

i wouldn't change the trap. it all looks good and will last many, many years as it is.
while it is wide open, i would loosen the plug on top of the drum trap and re-install it with some teflon based dope. make it easier to open if you have to in the future.

ditto

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