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Flaring tools form 45° flares on copper tubing for flare-nut joints in refrigeration, air-conditioning and heat-pump systems. For HVAC/R installers and service techs making leak-tight mechanical connections.
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A flaring tool shapes the end of soft copper tubing into a 45° cone that, once tightened under a flare nut, makes a metal-to-metal, leak-tight joint without brazing — the standard way to connect split units, manifolds and service valves. Kits usually include a deburring reamer to clean the cut edge and an eccentric (cam) yoke that swages the cone for an even, crack-free face; manual tools work via ratchet or screw drive, while battery-powered units speed up repetitive runs.
Choose by drive type (eccentric lever vs ratchet vs cordless), diameter range — typically 1/4"–3/4" (6–19 mm) to cover common split-system tubing — and suitability for high-pressure R410A/R32 tubing. Look for an automatic torque-limiting clutch (consistent flare height), quality dies and cutter wheel, and whether the set bundles a tube cutter and reamer. For A2L (R32), use tools and components rated for flammable refrigerants.