The set of water supply and drainage fittings installed on a fixture or appliance to control the water flowing into a fixture and the wastewater flowing from the fixture to the sanitary drainage system is called what?

The set of water supply and drainage fittings installed on a fixture or appliance to control the water flowing into a fixture and the wastewater flowing from the fixture to the sanitary drainage system is called what?

• A. Fixture trim
• B. Rough-in set
• C. Water hammer arrestor
• D. Air admittance valve

Answer: (A)

Fixture trim is the set of water supply and drainage fittings installed on a fixture or appliance to control the water flowing into the fixture and the wastewater flowing from it to the sanitary drainage system. It includes things like the faucet or valve bodies, handles, spouts, drains, escutcheons, and any shutoffs built into the fixture. These parts are installed directly on the fixture and regulate both the incoming supply and the outgoing waste. Other items you might hear about have different roles: a rough-in set is the behind-the-wall plumbing installed before the fixture is mounted; a water hammer arrestor dampens pressure surges in the lines; an air admittance valve serves as a venting device to prevent siphonage but doesn’t regulate the fixture’s supply and drain fittings.

Fixture trim is the set of water supply and drainage fittings installed on a fixture or appliance to control the water flowing into the fixture and the wastewater flowing from it to the sanitary drainage system. It includes things like the faucet or valve bodies, handles, spouts, drains, escutcheons, and any shutoffs built into the fixture. These parts are installed directly on the fixture and regulate both the incoming supply and the outgoing waste. Other items you might hear about have different roles: a rough-in set is the behind-the-wall plumbing installed before the fixture is mounted; a water hammer arrestor dampens pressure surges in the lines; an air admittance valve serves as a venting device to prevent siphonage but doesn’t regulate the fixture’s supply and drain fittings.