The Jobe Valves Rojo Part Fill Valve is a low flow valve intended for use in rain water harvesting tanks. 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. Additional filling of tank will not affect the fill valve, since it is designed to remain under water and only activate when the tank runs low. The part fill valve has been designed as a backup auto fill valve.