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Ah, so tubular is the ones that have the slip and screw-tight type that I see under sinks. It would be weird to have a long turn inside cabinets as well. Another knowledge acquired. Thanks!

I tried my best google-fu, but I still have no idea what that means. I will just use a regular elbow for that one. Thanks a lot Wayne. You saved me a lot of headaches. God bless.

Ah, good point! Oh, and the regular elbow (instead of LT90) below the sink 1 is fine because it's above the p-trap?

Got it. guess that's a must. I will try. Not at all to roll the 3x2, right? I will just keep it flat only maintaining the 2% slope. Got it. I will use a long turn elbow for that elbow. Guessing the ones above the stared one are fine with regular 90s. Oh, I was gonna use 2" for all the pipes...

Thank you Wayne. As a novice, I had to spend some days searching and studying to really understand what you mean. Now I think I understand some basic. I'm gonna use 2" pipes as it's wet venting, but not sure if I can achieve 2% slope. Will it be bad if I do 1/8" per foot? And how much should I...

Sorry guys, I have been away. Is there a disadvantage making WC vent through AAC? If there is, I can make the connection after the 3" main stack.(although much harder to achieve) Will that make the lav vent through the main stack as well? And I don't need AAC?

Anyone?

Hi guys, DIY plumbing question. 2nd floor, I'm moving a double vanity next to a toilet. Is this an okay application to connect the sink drain before the toilet vent like the image ? The sink will have a AAV venting, or can I share the toilet vent? Thank you for your inputs!