What parts are needed for a Nitrogen setup?

Im seriously thinking about running nitrogen/scuba. My tank has to be the size of a scuba tank. I just need to know what I will need as far as parts and where can I get them? Any help would be great.

BTW, I already have a Viair 550 comp that would be a backup, or visa-versa. Thanks is advance.

nitrogen bottle and regulator

you will also need a 1/4" npt to 1/2" line that will connect the regulator to tank. I would also add a check valve before the tank so if you run out of air your compressor wont try to refill the nitrogen tank too.

hit me up for a price

^^^ that setup is way too overpriced. You can get bottle brackets from www.weldingsupply.com for 25 each and then get the hardware from homedepot for cheap. and if you shop around on ebay for a nitrogen purging regulator you can get one for cheap. i paid 52 for my 450psi delivery smith regulator.