The DP-1 Nitrogen purge tools a quick and easy way to purge copper pipes with nitrogen. Then, with a turn of the dial, quickly switch to a very low flow 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. Inlet pressure of 50 PSI and max pressure of 200 PSI. The tool includes 1/4 in. male SAE ­flare outlet, 1/4 in. swivel female SAE ­flare inlet with a thread size of 7/16 – 20 and a rated purge flow 25-35 scfh (standard cubic feet per hour). This product is made by DiversiTech brand. 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