C02 Purge kits
 

Was stuck in a Holiday Inn so I wandered over to the petrol station to get a magazine (oh my god, I am turning into Alan Partridge), they only had Revs, it mentioned in one of the superb and well written articles about a C02 purge kit, an I right in thinking that this blows out c02 for effect, a bit like drag racers purging the nitrous system before a run ?

Or is it used for spraying onto intercoolers, didnt really get much info from the text, they were too busy calling it the daddy and how it made 'Punani's' wet.