We are sitting here wondering why on God's green Earth you would need CO2 tanks in a submarine. We figure that you must be planning on having a soda fountain inside! JP On 21 Jun 2002 at 22:28, Graham K wrote: > I'm wondering what kind of tanks I can use for c02 or 02, they have to be > the same diameter, I was thinking of getting some off ebay, but I'm not sure > which ones... > > > Regards, > > GK >