The Jobe Valves Vortex Bottom Fill Valve is a float-operated valve for use in automatic filling of water troughs. The purpose of the float valve is to automatically maintain a low level of water in the tank during periods of no or low rainfall. This allows services fed by the tank to continue while leaving capacity in the tank for refilling by the next rain. The bottom fill valve is UV protected to prevent sun damage to the valve. The valve's body unscrews for easy servicing and cleaning.