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I just ordered a 30 pack of those from Fastenal this morning. They listed around 2.75 each, which is crazy cheap compared to everywhere I've seen them.

I agree, I actually keep the unions on hand, since they're readily available at NAPA. But my local NAPA is hiring from the bottom end of the gene pool, so when I brought the fittings to them last week, they looked at me with a "OMG WTF" teenager face (despite being in their 40s). Then they...

Thanks guys! That's exactly what I'm trying to do as I go. I've done a LOT of push connects with my shop air. This is exactly what I'm looking for. What's the name of the thread type? Because I'm thinking it's 1/4" NPT female, (despite the tubing being 3/8). Or are these AN fitting?

While this will undoubtedly elicit flames of "it only took me 5 seconds to google this"... I've now spent the better part of 5 days looking for the answer. The Haldex site and all of the TM's list them as "air fitting" but never mention the size of thread type. So trying to source them...