King of the Elbows, Copper goodness

[NicePants42]

I thought about that and figured I may take some rough sandpaper to create some perpendicular roughness to it, and I do use wormdrive clamps. But the 7/16"ID and the 1/2" ID tubing I put on the fittings are really hard to get back off. The OD of 1/2" copper tubing is actually pretty close to 5/8"...

I'd just like to clarify the tube sizes that we should be getting here, since the tube spec listed with copper pipe fittings refers to copper tube, but we're using Tygon or similar.

It looks like you're saying that it's ok to use copper fittings with tube-ends sized to our Tygon ID - for instance, a copper fitting sized for 1/2" ID copper tube will still work with 1/2" ID Tygon, although the Tygon will now need to fit over a ~5/8" diameter on the copper tube end, right? This may actually be preferable in terms of good sealing. Is this correct? Can we assume that this is true for all common tubing sizes?

Also, if anyone has any idea where to get a nice variety of fittings like this, I'd appreciate links. Mcmaster seems to have a lot of male/female threaded tube fittings, but not many pipe-to-pipe fittings. I'd think that people on this forum could make the most use of tube-to-tube fittings, male 3/8" NPT to tube fittings, and male G1/4 to tube fittings, in 45 and 90 degree bends.

Edit: looks like Pexsupply might have what we're looking for, although their descriptions aren't exactly detailed.