what sort of air tank, fire ext or buffer (low pressure)? you will need; Valve (maybe two, help speed it up), regulator, 1000psi pressure relief valve, LP pressure relief valve, HP pipe and LP pipe plus fitting. This is assuming your using co2. visit; http://www.blazerbotics.co.ukwww.blazerbotics.co.uk theres a pneutmatics bit in the technical section, with links to other sites.