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Factory Sale Varies Widely Copper Reducing Couplings Joint Kits. High Purity Copper: Made of 99.9% high purity copper with a smooth surface for durability. 100% Quality Tested: All products undergo 100% testing before delivery to ensure safety. Wide Application: Suitable for industry, home, plumbing, HVAC, and refrigeration systems. Certified Safety: Products hold CE and CCC certifications for quality assurance. Sample Available: Samples are available with fee refund upon placing a normal order.