Which plumbing fixture is wall-mounted and receives only liquid waste?

Which plumbing fixture is wall-mounted and receives only liquid waste?

• A. Toilet
• B. Urinal
• C. Sewer cleanout
• D. Sink

Answer: (B)

Urinals are designed specifically for liquid waste and are typically installed on the wall, making them wall-mounted by design. They handle urine only, unlike toilets which take both liquid and solid waste and are usually floor-mounted (though some wall-hung models exist). Sinks drain liquids (and small solids) and aren’t restricted to liquid waste only, and sewer cleanouts are access points rather than waste-accepting fixtures. So the fixture that fits both criteria—wall-mounted and receiving only liquid waste—is the urinal.

Urinals are designed specifically for liquid waste and are typically installed on the wall, making them wall-mounted by design. They handle urine only, unlike toilets which take both liquid and solid waste and are usually floor-mounted (though some wall-hung models exist). Sinks drain liquids (and small solids) and aren’t restricted to liquid waste only, and sewer cleanouts are access points rather than waste-accepting fixtures. So the fixture that fits both criteria—wall-mounted and receiving only liquid waste—is the urinal.