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That's correct, there is another main vent/drain in the bathroom and a secondary vent on the bathroom sink. Thanks for the help...I think I'm on the right track now.

Herc and Garry, thanks for your replies. I checked it out today and found out that AAV would not pass code here. I am going to go the piped route for the vent I guess. I drew a basic diagram of what I'm planning and was wondering if there is a minimum distance required between where the vent...

Well I just took the sink out and where it tees into the 4" cracked off. Totally corroded. I think I'm going to take out the 4" and put in a 2" PVC drain/vent that will join into the old 4" in the basement. So if I was to leave the system as it is (except with 2" instead of 4"), when I move...

I'm not sure what the code is here. I live in Canada and I'm pretty sure it's the same for the whole country. A plumber mentioned using one to me before so I would assume they are ok but I will have to double check. I've tried to attach a couple of pics...one is the current setup and the...

I am remodeling my kitchen and would like to install the sink and dishwasher in an island. The sink is currently drained and vented on a single pipe that is separate from any other plumbing in the house. I am wondering if I can cut the pipe and remove the upper portion (ie the vent) and drain...