An isolation valve is a plumbing or refrigerant fitting used to shut off the flow of fluid to a specific part of the system for maintenance. In Ductless Mini Splits, these valves are located on the outdoor unit and allow you to trap the refrigerant inside the condenser during installation or repair. For Water-Plumbing systems, they are essential for servicing Water Heaters without shutting off water to the entire house. You can find high-quality ball valves and gate valves in our store to serve this purpose. Using isolation valves is a best practice that makes future ACIq system repairs much faster and less expensive. They prevent the need for a full system drain or refrigerant recovery for minor part replacements. Every professional Installation Kit should include these for a long-term service-friendly setup. They are the simple on/off switches for your home's liquid and gas lines.