No. It’s a different fitting than a CO2 regulator. The Nitrogen regulator and tank use a flare fitting similar to welding gas or propane. No washer required.

Mine says the company is in San Antonio TX (stamped into the unit itself). I can tell you it’s well made. I’ve had mine for 2 years and no problems.

There is no indication on the regulator where it was mad so I don't know. The only label includes TapRite as the name of the company that sells it and they are in San Antonio TX so it might be made in the USA but there is no way to actually tell.

The unit I received is branded Yaetek Nitrogen Regulator. There are no other markings on the body that might indicate the manufacture origins. I tried a bit of internet research on it but didn't find an answer to your question.

Argon and nitrogen cylinders have the same fittings so yes it will work on argon. I actually use it on argon as well and it works really well.

Yes I use it on argon.

I have been using this regulator for more than a year on an argon cylinder. I works as expected.

I don't see any reason it wouldn't work with pure argon just as it works with a mixture of nitrogen and argon. Both gases are not reactive and argon has a slightly higher density than nitrogen gas.

Yes the Nitrogen/Argon regulator will work for Argon. Both gasses are listed because they both need a high pressure gauge. This regulator can be used for either Nitrogen or Argon. Not for CO2!

That's the regulator I have and I use Argon..

I used this regulator with argon and it works well. I had leaks primarily with the pump and gauges that were eventually solved with a joint cement made for gases. It was my impression that the threads on the equipment were not well machined.

Yes it should work. However I have more success with Nitrogen if it is going toe used on wine. David

Your Argon tank should have a CGA580 valve. If it does this regulator will work.

Yes that's how I use it

I do not know. I have only used this with bar gas which is a mix of oxygen and nitrogen. Note that the threads or reversed (left hand) so the gauge is not attached to a carbon dioxide tank. That is the only left handed thread on a tank I have experience with. I had an argon tank on my arc welder and it "seemed" to me it was right handed thread. But that was a long time ago.