I hope when you look at this you have to think a little. Cartridges have multiple model numbers (C-100500-KIT, C-100501-KIT, and C-100502-KIT). If you go to their website and select their part number, you will need the serial number. Basically, this is the 3-digit number from the manufacturer of the toilet itself. It should then give you the correct part of the cartridge. I'm pretty sure the part I got isn't what I need. I ended up ordering from a Flashmate.
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