A pre-charged line set is a revolutionary installation component that comes with the refrigerant already sealed inside the copper piping. This eliminates the need for a vacuum pump or refrigerant gauges, making it the centerpiece of any diy-1 project. These are most commonly found in our MRCOOL systems, allowing for a "plug and play" experience. To ensure a perfect fit, we offer various lengths and mrcool-accessories-1-4-1-3 to complete the connection. These line sets are durable, insulated, and designed to prevent any leaks during the coupling process. They are the fastest way to get your wall mount unit operational.