What is defined as a fixture in plumbing?

A fixture in plumbing refers to any device that is used for collecting, delivering, or draining water or waste. In this context, the correct choice is a receptacle for waste collection, which embodies the primary function of fixtures in a plumbing system. Fixtures are essential components that provide access to water supply and facilitate the removal of wastewater. Examples of fixtures include sinks, toilets, and bathtubs, all designed to handle water and waste in various contexts.

The other options touch upon various plumbing components but do not capture the full definition of a fixture. A type of water closet is a specific kind of fixture, while a drain field component refers to part of a septic system unrelated to direct water or waste delivery. A type of drainage system encompasses broader infrastructure rather than a discrete device within a plumbing framework. Therefore, understanding fixtures as receptacles for waste collection provides clarity on their role within plumbing systems.