The solution to CO2 regulation is to get a regulator with an extremely low pressure second stage. Based on my current experience, I would say 0-5 psi full scale. To do this find someone who rebuilds regulators and ask them to build you one custom with a very weak spring and low range gauge. Then you can run your CO2 at 1-2 psi and handle it just like the output of an air pump. Dave Dave Gomberg, FormMaestro! San Francisco CA USA gomberg at wcf_com