? ?Material?: The main parts are made of solid brass which is durable and corrosion resistant.The gaskets are made of molded rubber which is soft and durable. | ? ?SIZE?: 3-F 3'' Float Model Flood-Guard for 3-inch Flood Drains | ? ?Introduction?: Flood-Guard operates like a check valve to seal off water back-up caused by overloaded sewers. Water flows normally through the drain until the sewer begins to back up. Then the Flood-Guard float rises to seal off the drain opening until the water recedes. | ? ?Adventage?: A screwdriver and a couple of minutes are all you need to install a Flood-Guard. Once in place, it can prevent property damage and a very messy clean-up job. | ? ?Package Include?: 1Pack 3'' Float Model Flood-Guard.