this is the complete setup. I'm think a 12 oz tank would be sufficient for emergency purposes. Thanks Cor Blmy for pointing me in the right direction.

I couldn't find the setup at ****. looks like that place is no longer around.

the 20 oz. tank came from

the regulator came from

the hose is an air tool pigtail from the local napa. the fittings came from the box in my garage.

note: the co2 bottle has to have the on/off valve to work with this regulator.