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Nitrogen improves the quality of any solder joint because it provides extra heat and helps prevent tip oxidation.The MN-A regulates nitrogen flow to the soldering tip in order to optimize consumption.It automatically activates the flow when you remove the T245-NA handpiece from the stand. The flow stops when the tool is placed backand the tip temperature drops to the sleep mode.It requires the GN-A generator or an available nitrogen supply at the operators bench.The MN-A works with DI control unit and the discontinued DD or DM.