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Thanks Smooky.

The vertical pipe above is only for venting...no fixtures drain into it directly. I am not a big fan of AAVs so I think I might just cut the existing tee out...couple in a short riser 2" pipe with a new sanitary tee and use a fernco coupler above as I do not have any vertical play to glue in...

Hey folks, I am installing a Kohler above-counter sink and it is asking for a drain that is 9" below the counter. Now the basement bathroom has the drain set at standard 18" off floor which is too low for this sink. To increase the height of this drain, I would like to use two 22deg elbows...

Can someone verify whether the laundry box and the dryerbox positioning is acceptable for a stacking washer/dryer? Are there any issues with placing 45s on the venting to avoid the dryerbox? I am pretty sure it doesn't have to be 6" above the drain?? See photo. Thanks

Yes...it ties into the main stack about 3" to the left of the picture. Thanks

I have a question regarding proper toilet installation. Is there anything wrong with installing two 45s directly below the toilet flange to gradually reach the main stack or should this have been on 90 with enough drop to clear the floor joists? I think that they hot water line might have...

I agree...these are not fail proof...no backwater valve is. They are not an 'install and forget' type of thing. I will still need to monitor it from time to time (every 3-4 months or when the city is expecting a major rain storm). Perhaps flush it out with a garden hose via the flush access...

To place a backwater valve on the main line, it needs to be normally open. City likes to use my vent lines. Unfortunately, Mainline does not make a 3" version of this valve as 3" is not as common in homes. I could place 3" std. backwater valves on each branch, but in my opinion, placing...

Should I try to use a 4x3 Fernco Eccentric Coupling to prevent the sewage from hitting the hub in a regualar reducer?

I planned a basement renovation on a 60yr old house and decided on replacing the existing cast iron lines with ABS, since I was already digging up the place. I decided on adding a new backwater valve that has been winning awards for its design. I purchased a 4" Mainline Fullport Backwater...