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Thanks, I thought about a AAV, but figured it wouldn't need it since normally the pipe end is open. Can't risk getting rid of the check valve, that 3" main comes from the upstairs, 2 toilets, 1 shower, 1 tub/shower, kitchen... That could be just an incredible mess in the worst case...

Thanks Terry, Ok attached are the two pic's #1 is 3" main with 2" coming off #2 is the 2" coming through wall directly behind washer. Note the "Tape joint" Last night I got a 2" coupler and another 10" of pipe to try and extend the stack to about 18" I didn't glue it just used duct tape...

John, the 2" ties it at the very end of the entire house out to the sept tank. The house is a "raised ranch" i.e the washer is in the lower level. So IF by chance the main out to the tank clogged and backed up, we need the check valve to stop flow into the washer which is now the "lowest...

We recently had the washer moved and a new 2" drain installed, but now we seem to be getting Suds overflow. Break down: Tapped into the main 3" a exit of house to sept tank i.e. right at the cast iron joint to PCV. run to sept tank about 10ft. Distance from main to washer is 7ft, pitch was...

we are moving the toilet location in the bathroom remodel my Q is this. the toilet will likely be more then 6 liner pipe feet from where the new location of the 3 stack vent is. So from what I have found we need to also vent the toilet. I would like to come out of the toilet flange into say...