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The RO float valve is an essential component of a reverse osmosis water filtration system, responsible for regulating the water level in the system's storage tank. Typically made of durable materials such as plastic or stainless steel, the float valve features a buoyant float mechanism that rises and falls with the water level in the tank. When the water level drops below a certain threshold, the float valve opens, allowing water to flow into the tank from the RO membrane.