Uses the principle of float water level to control the inlet and outlet water switch, to achieve constant water level effect, keeping enough water and always clean water. Floats always in the water, when the water rises, the floats follow up. And the rod driven by the rise also rises. Large water flow, high efficiency, good sealing. Works great for water trough, humidifier, fountain, aquarium, pond, chicken/dog/horse/livestock waterer, etc. The rubber seal ensures the kit is tight and leak-free, and you can easily adjust the float arm. Item Descriptions: Uses the principle of float water level to control the inlet and outlet water switch, to achieve constant water level effect, keeping enough water and always clean water. Floats always in the water, when the water rises, the floats follow up. And the rod driven by the rise also rises. Large water flow, high efficiency, good sealing. Works great for water trough, humidifier, fountain, aquarium, pond, chicken/dog/horse/livestock waterer, etc. The rubber seal ensures a tight and leak-free kit, and you can easily adjust the float arm. Float Ball Size: 95 x 50 mm / 3.74 inch x 1.97 inch Working Temperature: 0 degrees Celsius - 70 degrees Celsius Package: 2x 1/2 inch Float Ball Valve Item Specifications: Model: DN15 Material: ABS Thread: 20mm Apply pressure: 0.01-1.2 MPA Flow direction: One-way Brand: Unbranded/Generic