This is a float rod assembly, also known as a float valve. It is a component used to control the level of a liquid in a tank or vessel. The float ball rises and falls with the liquid level, which in turn opens or closes a valve to regulate the flow.
It is often used in steam boiler systems, water tanks, and other industrial applications.
The product is available from various manufacturers, including Mobrey, B&K Industries, and others.
It is available in different sizes and materials, such as stainless steel