Brass adapter question

[Scroooface]

I need to extend the gauge on my prod.. I have these adapters but don't know the psi rating on them.. I see someone used brass fittings like these with no problem but they were the wrong thread size so they leaked... These are the right thread size but I'm not sure if the pressure rating.. should the walls be a certain thickness?? These are 1/15 thick.. thanks in advance

 

[Stubbers]

Doubt those are rated for 3000~ psi, why not get stainless fittings? I personally wouldn't use 1/15" thick brass, but I would use 1/15" thick stainless.

-Matt

 

[Scroooface]

I used a stainless fitting in the past but had these laying around at my job and wondered if I could use them

 

[Tumblinginflight]

No. 1200psi or less for comparable finds. Without published data I wouldn’t run it above shop compressor pressure myself.