My guess would be the drain for a washer, but might it not be that they ran an extra vent instead of bath sink and shower grey combined or do you have two sinks in your layout and not just one? Yes, there is space there. Look up and sort of sideways through the shower skylight. Just guessing here.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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