When considering plumbing fixture load factors, which fixture has a DFU value of 2?

The correct answer is the kitchen sink, which has a Drainage Fixture Unit (DFU) value of 2. This value is part of the plumbing industry's system for quantifying the demand that different fixtures place on a drainage system. The DFU system allows plumbers and designers to calculate the total possible load on the plumbing system to ensure proper sizing of pipes and drainage.

A kitchen sink typically has a higher usage associated with it compared to some other fixtures, due to the potential for simultaneous use and the volume of water it may need to handle, especially during cooking and cleaning activities. This is why it is assigned a DFU value of 2.

In contrast, toilets have a DFU value of 3, lavatories generally have a DFU value of 1, and urinals can vary but often have values either lower than or equal to that of the kitchen sink. Understanding these values streamlines the design process and ensures that systems can accommodate the water flow and drainage requirements of multiple fixtures in use at the same time.