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Float valves are used for evaporation topoff, replacement of water lost from a system via evaporation. The float valve is placed in a section of the system where the water level fluctuates depending on the total volume of water in the system, typically the exit side of the sump.
Can be source from irrigation and plumbing supply, hardware and rural supply stores. Typically used for animal troughs, hydroponic top up devices or drinking water filtration.
Some available brands: