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1/4-3/8 Twin Insulated Copper Tube Copper Pipe for Air Conditioning. High Purity Material: 99.9% Pure copper pipe meets ASTM B280 and C12200 standard. Wide Size Range: Available in 1/4' to 1 1/8' with lengths up to 50m. UV Resistant Insulation: Made of Polypropylene, meets ASTM E 84, UL94, and ASTM D1056. High Pressure Rating: Pressure rating from 2100 to 7000 PSI, exceeding R410 requirements. Custom Branding: Customize insulation with company name, size, and meters. Comprehensive Warranty: 3 Years warranty coverage with free spare parts support. Global Certifications: Certified by TUV, ISO9001, ROHS, and SGS. OEM/ODM Service: Accept OEM and ODM with customization from samples or designs.