When de-winterizing an RV, what is the purpose of opening the faucet in the coach?

Opening the faucet in the coach during the de-winterizing process serves to let air into the system. This is crucial for creating a balanced pressure as fresh water is introduced into the plumbing. By allowing air to enter, you prevent potential vacuum restrictions that might impede the flow of water, facilitating a smoother transition as the antifreeze is flushed out.

As the faucet is opened, it allows water to circulate through the system more efficiently, ensuring that any remaining antifreeze can be removed effectively. This process contributes to a proper setup for the water system before you start using the RV again.

Additionally, while other nearby actions may relate to testing or clearing the system, the primary purpose of opening the faucet is fundamentally about ensuring proper air flow and pressure management during the de-winterization process.