Purpose and key benefit: A copper tube expander kit designed for air conditioning installation and HVAC work. Expands copper tubing quickly and accurately to create tight, leak-free connections. Easy, fast operation: The tube expander works smoothly to enlarge copper pipes with minimal effort, reducing installation time and manual strain. Hex shank for compatibility: Each expander has a hexagonal shaft compatible with manual and electric drills, including handheld and cordless models, for flexible use on-site. Five sizes included: The kit contains five different expander sizes to match a range of copper tube diameters commonly used in air conditioning systems, making the set suitable for varied projects. Protects the pipe: The tool maintains ductility during expansion to avoid cracking or damage to the copper, helping ensure a reliable, long-lasting, leak-free joint. Practical performance: Designed for repeatable, controlled expansion so fittings seal correctly and reduce the need for rework or additional sealing measures. Typical applications Air conditioner installation: Expanding refrigerant lines and preparing copper tubing for fittings when installing residential or commercial AC units. HVAC repair and maintenance: Field repairs, replacing sections of tubing, and preparing pipes for brazing or flaring during service calls. On-site plumbing and refrigeration work: Portable use with a cordless drill for retrofit jobs, tight spaces, or quick maintenance tasks. What you get A set of five copper tube expanders with hexagonal shafts, ready to use with manual and electric drills for reliable, professional-grade pipe expansion.