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stuff you want get for a hpa tank a tank cover so it dont scratch or dent. the next thing is thred covers and a nipple cap so you dont get dirt or stuff in your regulator. the next thing is to do is make sure the expire date is not over due or due if it is some places wont fill it cuz it can blow up. when its due  need to get it hydro tested meaning a company will take your tank and put it under a test to see if the tank is still good. if you own a carbon fiber tank and notice that the wrap is starting to peel this means you need a new tank cuz if you got it filled or keep using it  you can harm someone or your self. the worst then you can do with a hpa tank is put oil in the fill nipple if done dont use your tank the oil and the air dont mix this can cause the tank to explode. only oil the oring not the fill nipple