2″ or 3″ inch Wi-Fi Backwater Ball Floor drain is a mechanical device that is designed to allow the flow of water in one direction only away from your property. This is used on a sanitary sewer lateral they can offer a decrease in risk of sewage backup if installed properly and maintained adequately are ideal for water and raw sewage applications thanks to our reliable backflow prevention device reliable operation and all plastic highly corrosion-resistant construction. Cyclone valve features a full flow design providing maximum flow for each ball valve and a positive seal with minimum back pressure when the flow stops. Our Valves are installed in the sewer line ahead of any fixtures. In the event of sewage being forced back into a property during a flood event, the ball inside the valve is closed within the valve to prevent the sewage from entering the property. Note: Water Sensor only supports Wi-Fi 2.4GHz.