Breather or Vent hose which connects vent unit to the washer tub helps the machine air out between washings and allow humidity to escape during the final spin cycle.
Air movement has it’s place in the overall washing cycle, as well as allowing built up moisture to dissipate somewhat while it is at rest. The purpose of venting is to allow air to escape from the pipes as water tries to flow down.
If water drains from the sink, air can be pushed out through the top of the washer’s drain, and vice versa.
Used in washing machines for providing air-flow.
It facilitates both the fill and draining process.