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Miller MetalTrough-O-MaticSee on Walmart
Miller Manufacturing Aluminum Trough O Matic Float Valve controls the majority of the water levels in most metal and plastic stock tanks, troughs, pans and barrels. It's compatible with a standard garden hose. The stock tank float valve has a capacity to flow up to 375 gallons of water an hour. It also works at a pressure between 20 psi and 50 psi. The water trough float valve allows for freshwater to be filled in an open tank, making it useful for livestock or other applications where a constant water supply is needed. The assembly is minimal and setup is easy to do. It's lightweight but durable, made of an aluminum casing with a brass and nylon orifice. All parts in the unit are replaceable, meaning it can be maintained for years to come.... read more.