Thanks for the replies. The sharkbites isn't bad but I would trust a compression coupling with brass ferrules more, I think.
Firebirdparts....I have an old flaring kit I bought 30 years ago. I'll see if it still has the fittings. I like what the guy did in the video.
Pancho400cid...if anything, I'll try making a light flare I guess. I made my own bubble making tool which worked decent with a vice. The tube I experimented on was 5/8 aluminum with a thick wall so eventually the edges started to crack...so I threw out the tool. Maybe I should make another, just smaller to fit inside.
Thanks