I'd like to hook up some kind of blow gun to my CO2 tank, which I could easily use to purge bottles, carboys, and kegs. One with a hand trigger or button and (ideally) detachable wands of varying lengths. Are the ones made for air compressors food-safe? I don't really want to blow a bunch of oil into my beer. If not, does anyone know of something I could use for this? Currently I just use a piece of tubing, which works fine, but I'm lazy and don't want to lean over and open/close the valve on the manifold every time I purge a bottle.