Is it acceptable for two branch lines to connect to the building drain using a 45 degree wye fitting with the branch inlet rotated up? One branch line is for two bathrooms and uses a horizontal wet vent. It is about 8" higher than the branch line for the kitchen sink and laundry room. Hopefully this drawing makes it clearer but my isometric drawing skills have left me. The house is a single story over a 30" high crawl space.