Phos 15 Brazing Rod 2mm Dia x 500mmPhos 15 is the benchmark for superior performance in HVAC R (Heating, Ventilation, Air Conditioning, and Refrigeration) applications and is widely used for joining copper to copper joints. Best for: This product excels in critical joints, high pressure systems, and equipment exposed to vibration or significant temperature changes. Consideration: While the initial investment may be greater, Phos 15 pays off by minimizing long term labour and repair