Backwater Valve Floor Drain

backwater valve
Sewer line valve that prevents sewage from flowing back into the house.
A device installed in a drainage
A backflow prevention device is used to protect water supplies from contamination or pollution.

floor drain
(Floor Drains) A hole or opening located on some restroom floors to allow water to drain from the floor surface into the sanitary sewer.
Drainage fitting that sits flush with the floor, used in basements and showers.
A floor drain is a plumbing fixture that is installed in the floor of a structure, mainly designed to remove any standing water near it. They are usually round, but can also be square or rectangular. They usually range from 2 inches to 12 inches, most are 4 inches in diameter.