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Just if I should use a double wye or a double santee at the level of the test, which is at the same level as the utility sink inlet. It probably doesn’t matter either way. The actual cleanout is provided higher on the stack

I think I’ll stay with the double wye for where I can stick the long test ball down (and serve as a bonus cleanout). Wisconsin's code doesn't look like it forbids using one side of a 4x4x4x4 double sanitary tee as a way to insert a test ball, but it's not as if it says it's allowed either. UPC...

I looked into those, but do they even make 4x4x4x4 double fixture fittings? https://catalog.nibco.com/viewitems/pvc-dwv-fittings-2/4835-b-double-fixture-tee-pvc goes up to 3”. Plus, there is a vent prior to the drain connection to the stack.

Hmm... looking at the intent of the code, the double sanitary tee restriction on kitchen sinks and WCs is because of high flow and pumping action drain fixtures. While no one should drain the washing machine into the utility sink instead of the standpipe, I suppose someone could. And the drain...

Late update - looks like I can switch the double wye to a double sanitary tee anyway: "(i) Double sanitary tees. A cleanout shall be provided immediately above or below a double sanitary tee drain fitting which is installed in a vertical drain pipe of less than 3” in diameter, unless a stack...

Thanks for the heads up on that! It turns out that Wisconsin doesn't have a "one size smaller on stacks" cleanout exception that other codes appear to have. Guess I'll need to keep it 4" up to the reduction to 2". The standpipe should still hit the requirements but my 4.5" of wiggle room is now...

Thanks, it doesn't seem incorrect per any drawings I've seen, but those are almost always UPC. Anyway, I reworked the base a bit to allow for a pressure test with - might need a long test ball or a 3-4" multisize, we'll see. I'll end up with two cleanouts near each other, but the test ball has...

I have an improperly drained kitchen sink and utility sink situation that I am cleaning up (including permits and inspections). I think that my question is specific to Wisconsin plumbing code. To the best of my knowledge, section 905.5 of the UPC explicitly allows a design like shown below...