I've used this to flare copper tubing for my mini split, I've never experienced flare up, having bought cheap in HD and HarborF they were practically useless , it seems the work. I don't think it's leaking but we'll see in the winter as I've read it's going to be under a lot of pressure. I think I'll buy the Yellow Jacket brand if I get the chance as it has a limited shelf life so don't guess. It is also 3 times more expensive.
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