I have two vanity sink drains that converge into a single downward 2" pipe in the wall, with a 4 way junction. The top of the junction goes up to the attic and is a vent.
I want to add a utility laundry sink and a washing machine drain to the room that shares a wall with the bathroom, meaning I have easy access to the existing drain. I want to tap into the 2" drain and bring the two new drains into the existing 2" downward pipe, where the yellow is in the diagram. I also included what's under the floor in the crawlspace in case that matters.
My question is, is the existing vent sufficient for this situation? Is this going to cause any issues with the washing machine? My understanding is that technically I have a wet vent here, but unsure whether that matters, especially since the two sinks are pretty low volume in terms of usage. Thanks for your help!