Premium 50ft Copper Lines: Made with 99.9% Pure C12200 Copper and Thick-Wall for bend-resistant, leak-free installation of your mini split line set even when routing through walls Extreme Reliability: 850 PSI pressure rating well above R410A operating range ensures stable performance for mini split ac line set in extreme heat, reducing burst risk Compatible with All Models: Standard 1/4 inch liquid line + 1/2 inch suction line configuration matches all 12000-18000 BTU mini split copper line set for hassle-free installation Energy Saving Insulation: 3/8 thick PE+EVA composite insulation is stronger and weather-resistant than standard, effectively lowering cooling loss in your mini split installation kit and condensation Outdoor Protection: Includes 2 Weather-resistant strapping tapes for long-lasting outdoor performance and quick secure installation of mini split tubing for a neat, professional-looking setup