Idea: Is it mine? Auto fill reservior using tiolet tank float?

[SpaceNeedle]

Thanks SN,
There is a Tractor Supply nearby. Do you happen to have a brand or model number to look for?

Try not to get the kind that clip onto the top edge of your "watering trough."
The one I have is very similar to this one:
Google Image Result for http://www.made-in-china.com/image/2f0j00mBLTNSyMMPqUM/Hot-Water-Float-Valve-DN15-.jpg