I think he is thinking brass fittings?? When I bought my brake line tube, it already was flared and had a steel male thread 1/4" IPS fitting already in place. I was just going to tap the vent tube and then thread in the fitting and just tack weld it. Hell, I imagine some JB weld would also hold it there and not leak. It is high enough up the tube so as not to see any liquid.