Nitrogen tank pcp adapter

[gte345]

Where can I get a fill station for a nitrogen tank?
I do HVAC for a living and I carry a nitrogen tank everyday, I have a few Hpa tanks but I fill them up with a hand pump lol, I’m searching for a nitrogen tank adapter but I only find the normal regulators that go up to 1000 psi outlet. Any help would be appreciated .

Thank you all

 

[SFeltus]

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[Smok3y]

^^^^^ THIS ^^^^^
That is what I use.

 

[Trucker3573]

What has already been posted however I would like to add that make sure the adapter you buy matches the type of valve that is on your HPA bottle.