Replacing tank parts in American Standard Champion
I bought a newly-contructed condo 2.5 years ago, and it came with an American Standard toilet installed. I've had the flush valve break on me twice already, and I'm at a point where I simply want to replace it with something new. As far as I can tell, I think it is a Champion 4, but I am not very experienced with toilets, and I'm having difficulty verifying this. Here is a photo:
I was hoping to confirm that this is the Champion 4, and also find out what I should buy to replace it? As far as I can tell, it seems that American Standard has released an upgraded version. My building has a new super, and he told me he could get me a new valve for $150, which seems beyond absurd and a complete ripoff. If anyone has some insight based on this photo, I would really appreciate it.