The material of the water float valve ball is made of PE, while the other parts are made of POM. They are resistant to low temperatures and corrosion. The plastic water tank float valves have adjustable arms that can be adjusted up to 180 degrees. You can easily set them according to the water level requirements to automatically control the water level. No power or pump is needed. Operating the valve ball is simple as its angle is adjustable. You can set it according to the desired water level without the need for power or a pump. These water float valves are suitable for low-pressure gravity water supply systems. Just hand tighten them to ensure leak-free operation. They are ideal for applications such as reverse osmosis systems, fish aquariums, ponds, water pumps, water troughs, fountains, water tanks, reservoir tank mounts, and more.