The Source component can be found under Helpers - PhoenixFD. It consists of parameters describing the properties of the released fluid. The gizmo does not release the fluid itself, instead it is just a container for the parameters. The fluid is released from the surface of the selected objects. The Source component does not care which simulator is going to be affected. It works with every simulator which interacts with it. So the Include/Exclude list of the simulator can be used to restrict the undesired interactions. Each parameter of the released fluid has a map slot allowing space modulation. Each parameter has a checkbox that controls whether or not the source will affect the corresponding channel.