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Yeah I didn't find anything in the code just reading what others have wrote on this forum and other places. Looks like in California they want all drain line to vent above the house. Also read somewhere that mentioned water softener drain line should be no more than 30 feet so that might have...

While researching more I just found that AAV are illegal in CA. I think I'm just going to run 50 feet of 1/2" tubing across the garage and down a sink.

Thanks Guys! I think I got it now. I'll install an AAV right after the P-trap inside the garage. https://imgur.com/a/GjNMY6U

I did a quick sketch. Will this work? Is the air gap also a vent or does it need a vent after the P trap and before entering the sewage drain line on the outside? https://imgur.com/yvd6dFz

I currently don't have a drain line near where I'm planning on installing my water softener. I'll be installing my water softener inside my garage directly on the opposite end of where the main water line is coming from outside. I'm planning on drilling a hole through the sheet rock and stone...