Tube flaring bit - GIF

[mwmkravchenko]

I think I will be making this! Thanks.

[metric_taper]

I looked at a set of them last year, pricey. Seems easy enough to make from tool steel and then harden. Also saw a youtube video of a HVAC tech that drilled a hole in the side of a suction manifold, and used this tool to make a raised surface, in this case he was installing a thermostatic expansion valve reference pressure tube, on a large system. This produced a stronger hole to braze the tube into.