sink drainage

Guys - great site. I’ve been a reader for a while but am now a poster. I am building a big outdoor kitchen for a customer under a coastal house that is up on stilts/columns. The drain for the house hugs one of the columns. It is 3” PVC Until about 3’ above pavement. There is a clean out and...

I have a tight space in which I need to install an air admittance valve (AAV). The below image shows the back of the wall behind my bathroom sink that is competing with my nearby tub drain to see who can suck out the other's p-trap faster. From my review of IRC P3114, my options seem very...

Hi - I am running into a situation that many of you have run into before but I could not find the best solution to it after searching through these forums and also googling other options for over a day. My garbage disposal in the kitchen sink stopped working after 15 years and I just replaced it...

I have a dual kitchen sink with recently installed drain plumbing that is not draining slowly (pictures below). Prior to the new plumbing the AAV was about 10” above the top of the lateral line into the wall (where it goes to a 90° and into the slab). The disposal had no trap, it was a straight...

Hello all, First time I'm using this forum... I am doing a remodel with approximately back to back kitchen and lavatory sinks. The 2" drain and vent pipe is offset and I have a 2"x2"x2" sanitary tee to attach the 2" horizontal drain line to. I am considering attaching a 2"x 1 1/2" x 1 1/2"...

I'm doing a renovation and I'm installing a new sink. For some reason I can't wrap my head around how to properly vent the drain. I ripped open the wall behind the toilet and found two pipes, one I'm assuming is the toilet drain and the other, the vent. Which pipe do I drain the sink into? A...

Im remodeling my basement and i was wondering if this would work? I would like to do the least amount of demo to the floor as possible.