bike pump. 16oz can fill 1/2 way with cropdust batter of choice. pressurize to desired psi not exceeding 90. 60 is as high as i've gone. got it off menards online 20$ shipped. came with 3 tips. it could be whatever... airduster, oiler, cleaner... I'm a sucker for new cool ass ergonomic tools. def getting at least juan more meow!!!