Which of the following items is NOT classified as a plumbing fixture?

An oven is not classified as a plumbing fixture because plumbing fixtures are specifically designed to connect to and facilitate the flow of water and wastewater in a plumbing system. Examples such as toilets, sinks, and bathtubs are all plumbing fixtures because they are connected to water supply and drainage systems, allowing for the use of water for sanitation and hygiene purposes.

In contrast, an oven serves a completely different function; it is an appliance used for cooking food and does not involve plumbing connections for water or waste disposal. Therefore, it does not share the same characteristics or purpose as plumbing fixtures. Understanding the definitions and functions of these items is essential in the construction and plumbing fields.