^ Jeff,
You need the pdf to determine the solenoid, there are a few suitable ones. Here is the model number of mine -
VDW20-15A-1
First guy ever to add active cooling to his rig. The solenoid gets pretty toasty too, maybe because it's stainless steel.
I used the pdf.. those were "translations" of their cluster...puppy (well it is not terrible, but I've seen better) The above specs are right from SMC..
And I know I'm being "picky" here.. as is my right....

Eventually I'll either need to "lower my expectations" or give up..
Right now I dribble so little CO2 that I could theoretically run solenoid less..
And if not for the AC buzz of the one I just removed.. and even considering it's "high " wattage..( a 1/2NPT solenoid dissipates a lot of heat, NOS "union made"

) it would have been fine.. BUT I'm not feeling the love to put it back in line.. yet...
Pretty sure in a short time I can get something to make do.. it just might cost me more than planned... or it might mean reconfiguring a bit..
I haven't even got to the check valve part yet (hint run multiple cheap ones in a pinch.. one will not do...)..
