Float valves can be used to prevent overfilling or overflow of tanks when the liquid needs to be diverted rather than dumped in a drain. Suitable valves can be mounted on the base of the tank with the outlet piped through the tank wall. The valve communicates with the float arrangement by suitable links.
Many float valves have interchangeable ball floats dependent on what media the float is sitting on. The options are usually either plastic, stainless steel or copper.