The Nitrogen Purge Tool is a quick and easy way to purge copper pipes with nitrogen. Then, with a turn of the dial, quickly switch to a very low ow of nitrogen to properly braze the copper. It has a durable aluminum design so you can just throw it into your tool bag when you are done. Diversitech Nitrogen Purge Tool, 1/4 in Nominal, Male SAE Flare x Swivel Female SAE Flare End Style, 200 psi Pressure, 25 to 35 scfh Flow Rate, Domestic