What is the function of a yoke vent in plumbing?

The function of a yoke vent in plumbing is to prevent pressure changes in stacks. Yoke vents are typically installed in vertical drainage systems, helping to equalize air pressure in the drainage stack and the venting system. This balancing of pressure is crucial because it allows for smooth drainage and prevents the occurrence of siphoning, which can lead to drainage system malfunctions. By maintaining consistent pressure, yoke vents ensure that water flows freely through the system without undue strain that could cause blockages or backups.

The other options do not accurately describe the specific role of a yoke vent. Supplying additional water, connecting drainage systems, and filtering air in ventilation systems are functions associated with other plumbing components and systems. Hence, the role of a yoke vent is distinct and essential for maintaining the efficiency and functionality of waste drainage systems.