I think this is what I want, but I'm not sure. I need to put some kind of flare/bulge, on the end of .375 x .035 6061-T6 tube. So I can attach a 3/8" vinyl tube, using ear-clamps or crimp ferules ( if I can get a crimping tool into the space ). This will be used at 50-psi Max.
All of the bubble-flare tools I've found are metric. I've found kits that will do single/double flare, GM fuel line, & ISO bubble.
From looking at the tiny pictures I've seen, a bubble flare, looks like a double flare without the final plunge.
What I want may not be called bubble-flare, which is why I can't find it. I've seen this type of flare on air-conditioning lines & oil coolers.
I'm also thinking I may need to anneal the tube to prevent cracking.
Thanks in advance, for any words of wisdom.