threaded metal air valve

i am thinking about buying some of theses what i want to do is hook this up to a 1/4" ice maker water supply and use it as a top off system possibly hooking this up to my arduino and using a servo motor to open and close the valve

Does anyone have one or some of these valves they would be will to sell?

I have a bunch of them but I'm not sure they are 1/4". Regular air line tubing fits on them.

DavidZ

Are they threaded on one side? I think standard threaded size is 1/8" I was going to buy a 1/4" to 1/8" reducer?
Can I buy one from you?

I think they cost me like a buck or so. Drop by and I'll just give you one.

I'll PM you my address.