EA type anti-pollution check valve double drain have the function to separate the upstream and downstream of water system, it avoid the home water returns to the network. And It allows to treat the water returns.
The flow switch is a controller of flow with paddles. Its permits the detection of flow or no-flow. Its is usually install on suction to protect the pump against the low water level (dry-running protection). Maxi. pressure to 10 bar, 230V, maximum 15A.