The flow meter can be used with a water flow divider to understand the flow of the coolant from the position of the internal float. You can choose a model with a temperature gauge to know the return temperature of the coolant. The flow meter has internal and external threads, and the specifications include 1/8”PT, 1/4”PT, 3/8”PT, and M16. The appearance is available in round, hexagonal, and square shapes.