What is permitted to be connected to the laundry tray waste line for the automatic clothes washer drain?

The automatic clothes washer drain is specifically designed to handle the waste water produced during a laundry cycle. According to the International Residential Code, a standpipe is permitted to be connected to the laundry tray waste line for this purpose.

Using a standpipe allows for proper drainage and venting of the waste from the washing machine, ensuring that water flows freely and efficiently without risking a backup. The standpipe must be of appropriate height and diameter to handle the volume of water being drained from the washing machine, adhering to the guidelines set forth in the IRC for both plumbing and drainage systems.

In contrast, other options like a sink, floor drain, or grease trap do not meet the specific requirements for connecting to the washing machine discharge. A sink may have additional waste characteristics that do not align with the washing machine's discharge needs, while a floor drain is designed for different purposes and may not be equipped to handle the volume or type of water discharged from a washing machine. A grease trap is specifically meant for trapping fats, oils, and grease from kitchen wastewater and is not suitable for laundry waste.