Which term refers to a device that can create a vacuum to allow for drainage?

The term that refers to a device capable of creating a vacuum to assist with drainage is a vacuum breaker. This device is important in plumbing systems as it prevents backflow of water, thereby safeguarding the drinking water supply from contamination. By creating a vacuum, it helps facilitate the efficient flow of wastewater toward the drainage system.

A vacuum breaker essentially allows air into the plumbing system after a negative pressure event, which can contribute to maintaining proper drainage. Its role is critical in specific applications where backpressure can occur, and it works by preventing conditions that could cause a siphon effect, thus avoiding potential hazards in the water supply system.

The other options—pressure regulator, pump, and vent pipe—serve different functions in a plumbing system. A pressure regulator manages water pressure, a pump moves water or other fluids from one place to another, and a vent pipe is used to provide airflow in drainage lines to prevent siphoning. None of these directly create a vacuum specifically for aiding drainage in the way that a vacuum breaker does.