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thanks! I do have a vent on the 3" line. the main is several inches below the tub drain. should I bring it to the 3" line as long as my overall length is less than the 5' and wet vent (I think that's the max length??) or would you bring a second 4x4x2 wye to the main?

Need some assistance from the experts. I'm adding a master bath, complete with a new slab and frost free footings (20" thickened edge). the 4" main to my septic runs underneath the new addition. The location for the new tub puts it almost vertically above the 4" main and near the edge of the...