Manifold is a kind of water distribution and water collection device, which is used to connect the water supply and return of each heating pipeline in the water system. According to the inlet and return water, it is divided into water separator and water collector. So it is called distribution manifold or water separator, commonly known as water separator. The water separator used in the floor heating air conditioning system should be made of brass, and the water separator used in the household ground reconstruction of tap water supply system is mostly made of PP or PE. Exhaust valves are used for water supply and backwater, and many water separators also have drain valves for water supply and backwater. The front end of water supply should be equipped with a "Y" filter. Each branch of the water supply branch pipe should be equipped with a valve to adjust the water quantity.