I think so, since the toilet starts to fill the instant you flush and doesn't stop until the toilet is full. That binary ON/OFF type thing isn't operated by the pressure of the water if I understand correctly, it's operated by water level in the tank. If I have a few extra pieces laying around I will test out the gravity feed portion, but I will be testing it on the counter next to the toilet first, because if it works there, it will for sure work in the attic. It's possible you will have a thumbs up or thumbs down tomorrow on the gravity feed, but it seems a simple siphon action would fill the tank.
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