MRCOOL No-Vac Linesets are a revolutionary innovation in the HVAC industry. They allow you to install a mini-split system without the need for vacuuming or brazing the refrigerant lines. This saves you time, money and hassle. MRCOOL No-Vac Linesets are pre-charged with R410A refrigerant and come with flare fittings that connect easily to the indoor and outdoor units. They are compatible with most MRCOOL mini-split models and have a 25-year warranty. MRCOOL No-Vac Linesets are the smart choice for DIYers and professionals alike.