thanks for your patience, i had to look it up some jargon because i wasn’t sure. it’s a niagara flapperless toilet. tip-bucket style. rather than have a full tank all the time, there’s a bucket of full water sitting 2/3 up the tank. you turn the handle, it dumps the the bucket. the flapper gets removed. saves a shitton of water. the force of the bucket of water moves the turds. I was pleasantly surprised it actually works.