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It's alive, fills and shuts off cycling seemingly normal. Except for the other leaks in the output line from switch to manifold. Apparently NPT fittings DO need thread sealant and to be screwed in all the way which makes the copper pipe too short now. Someone along the line put copper lines...

I found a seemingly working solution for pretty cheap. I updated the end of the first post

Well I'm really not concerned with most...I just need this specific situation solved. I do need the nut for the other end but that should be easier with a compression fitting.

The first one seems to be an inverted flare which I think the pressure switch end is. That seems to be available most anywhere as a M10 unloader line or similar. But there isn't much for specs on em. Then there's only a nut on the 1 end. The 2nd seems to be similar to 1 I just found and listed...

This seems like it might be right eh? M3-3 - 10mm x 1.0 Fine thread, female steel nut - SAE flare Then says use with the fitting shown below it. Which seems to be a union that matches what I have https://store.fedhillusa.com/m33.aspx

I confirmed with a nut that it is M10-1.0 with the nut smoothly and consistently threading all the way on. It seems NPT is close but wouldn't be consistent being NPT. But now I need to find a flare nut

Confirmed it's M10-1.0...but where can I find a flare nut

No not really, I had considered using a die to change the outside threads. But AI says it would require downsizing it too much and high risk of rupture from repeated pressure and temp cycles.

Yea I'm familiar enough with threads and pitches...just trying to find the right fitting. I found a reference that said that fitting is a 1/4" compression just kinda unusual style with a cone and it's 1/4" compression threads which are so close to M10 they're frequently mistaken.

Error

That is a last resort, I was hoping simple and cheap. Otherwise maybe a hydraulic shop has an adapter or nut

Problem is finding a fitting that fits it...I have nothing for it. Can't seem to find an M10 flare anywhere. I'm gonna try to buy some M10 nuts and see if they fit right. Some info says it's an import valve sold in bulk to manufacturers. Not common otherwise, others say it's just standard 1/4"...

I did indicate M10- flare nut doesn't seem to exist in the US. 1/4" flare is too big, 3/16" flare is too small. I tried an AI that says it's a compression fitting just not common used in US. But supposedly a 1/4" compression nut is nearly identical to M10 and often mistaken

So it appears to be around an M10 flare. It's smaller than 1/4" flare but larger than 3/16" flare. The outside of threads measures 10.36mm. Update CONFIRMED: It's M10-1.0, by a nut that seemed to fit well. But now where to find an M10-1.0 SAE? flare nut It's on an ALL Power APC4005 Twin stack...

That's cool, didn't realize there was another style

Remind me never to let you near my stuff then haha

I was recently using rivet nuts (rivnuts) for the first time, after hearing about them for years...debating between the steel or alum. Then after I got done I got to thinking which one is stronger...or what can they hold. So I jump on the ole YT and hey there's a vid showing the aluminum. So...

Depends on who you ask. Many say never weld a tank the heat changes the steel and makes it weaker. Many others weld on em and they work for many years no issues. But if ya can weld...technically it's as easy as drilling a hole and weld the bung in place.

Getting a site error trying to add the final pic, so might have to wait a bit.