The model of this particular faucet is unknown although I believe it is a Kingston brass given the handle design. If you need to find out the model of your faucet you can check the handles for the brand tag/logo or the stem canister of the handle. To check the stem canister you may ...
The toilet fill valve is held in place by a large nut and it has a rubber seal to stop the water from leaking out of the toilet tank. When the nut is loose or the seal is bad, there can be a leak at this location. For instructions on how to tighten or replace the toilet fill ...