Made from brass, strong and corrosion resistant, suitable for connecting to short flare nuts for pipes or fittings, brass has corrosion resistance, high temperature ductility and low magnetic permeability for fuel and gas systems, pipework, refrigeration and vacuum applications. Non-corrosive and resistant to bursting, flare fittings are an alternative to welded fittings for the air conditioning and refrigeration industry where a welding torch is not required. These fittings are precision machined and have tighter, deeper and smoother threads than conventional products, making work easier and more efficient. The Air Conditioning Copper Pipe contains different sizes of twin pipes, you need to buy the appropriate 2 pairs of fittings according to the size of your air conditioner.