Thanks for the reply sailnut.
I only ask because it doesn't take a mathmagician (pun intended) to figure out that, though the initial cost is comparatively low, in the LONG RUN the fluval CO2 replacement's are not economically efficient (here they run $12-$15 per cartridge).
So, I intended, not necessarily to attach it to a 10lbs or even a 5lbs tank, but to try to adapt it to a slightly larger cylinder (9-12oz) that is refillable and lasts a little longer then the 2-3 of the 88 gr.
I was just curious to see if anyone who purchased the kit some time ago had already tried or looked into adapting it.
Tomorrow I'll take a day to drive around to some shops (paintball, bike, plumbing, auto parts, etc) and ask around about adaptors and I'll maybe send Fluval an email asking what the regulator is rated.
PIMP #427 - 2 x 2213, 1 x 2206, 1 x Surface Extractor