For residential clothes washer standpipes, the receptor shall terminate at what range above the floor?

• A. 10 to 20 inches
• B. 18 to 36 inches
• C. 26 to 48 inches
• D. 30 to 60 inches

Answer: (C)

The height at which the standpipe receptor ends above the floor sets where the washer’s drain hose enters the standpipe. This position needs to be high enough to accommodate the washer’s discharge hose and provide reliable gravity drainage, but not so high that the hose can’t reach or that drainage becomes awkward or prone to overflow.

Choosing a receptor height in the 26 to 48 inches range provides a balance: it fits typical hose lengths and ensures the water can drain freely into the standpipe without splashing or spilling, while still being low enough to avoid placing excessive work on the hose or the standpipe. If the height is too low, you risk splash-out and overflow during a fast drain; if it’s too high, the hose may not reach or drainage may be inefficient. That range is the standard window that best accommodates common washers and their hoses, making it the best answer.