The Vevor mini split line set is designed for mini-split air conditioning and heating pump equipment, providing a 25' connection between indoor and outdoor units. It features 1/4" high-pressure and 3/8" low-pressure pure copper pipes built to ASTM-compliant standards for durability and resistance to flattening. Triple-layer insulation helps protect the copper tubing while improving insulation performance. The included accessory kit supports an easier installation process without welding. It is compatible with 0-12,000 BTU split air conditioner systems.