Residential washing machines drain pipe extension height above the floor should be what in inches?

Residential washing machines drain pipe extension height above the floor should be what in inches?

• A. 12 inches
• B. 6 inches
• C. 18 inches
• D. 24 inches

Answer: (A)

The amount of vertical extension for the washing machine drain is chosen to give the discharge hose a reachable and fitting entry point into a standpipe while still allowing the trap and piping to function properly. A 12-inch height above the floor provides enough room for the washer’s drain hose to insert into the standpipe, helps keep water from splashing onto the floor, and keeps the connection accessible for service. If the height were much higher, the hose could be hard to connect or could draw water back into the washer; if too low, there may be splash or backflow concerns and insufficient trap arrangement. In the context of this item, the expected practical height is 12 inches.

The amount of vertical extension for the washing machine drain is chosen to give the discharge hose a reachable and fitting entry point into a standpipe while still allowing the trap and piping to function properly. A 12-inch height above the floor provides enough room for the washer’s drain hose to insert into the standpipe, helps keep water from splashing onto the floor, and keeps the connection accessible for service. If the height were much higher, the hose could be hard to connect or could draw water back into the washer; if too low, there may be splash or backflow concerns and insufficient trap arrangement. In the context of this item, the expected practical height is 12 inches.