I've seen a couple conflicting answers here for whether or not a second p=trap is necessary, my understanding is 30" is the max distance between drains to share a p-trap, which my vanity is. I was able to rig it without a p-trap but could easily add one but want the extra storage space.
I've tested it with a full sink on both sides and it drains fine, so is there any advantage to the second p-trap? The tailpieces from the sinks are 1 1/4" and the tee and p-trap and drain are 1 1/2" so I figure there is more than enough capacity for drainage from the sinks. Also is there a recommended amount of slope here for this connection? I added enough slope so that my 6" level touches the line so like 1-2 deg.
Apologies for the distorted image, it was wide angle
Edit: so everything is working now...except the drain is very loud! When I use the left vanity, the long distance to the p-trap is causing a lot of noise to travel up the open drain for the right vanity. Thinking I should now add the second p-trap just to provide a noise baffle.
Would it be best to tie in past the left p-trap with a wye or would installing a p-trap on the horizontal tied in before the left p-trap ok? I'm guessing p-traps in series may not be kosher but having a hard time finding the code.