Circle has over 100 of these small-animal waterers. They are made by Surber Tank Company, Odessa, Texas. The internal valve is 3/4,” brass. It holds about 3 gallons. The tank must be maintained very full even though animals can walk down the ramp: quail prefer it full.
Weak points are light weight and the pvc connections: the appliance must be protected from herds when cattle are present. We do this by surrounding the tank with a cattle panel when the herd is present for a short grazing stay.