7000 Series Ermeto Steel Flareless Fitting, 0.50 Inch Tube OD To 1/2-14 Male NPT, Straight

Hard copper is on the approved list alongside steel, stainless steel, aluminum, and half copper. The key requirement is extra heavy wall tubing, since these fittings are built around that wall thickness. Standard thin-wall copper won't cut it here. As long as your copper tubing meets the extra heavy wall spec, you're good to go.

It is a straight male connector that goes from 0.50 inch tube OD to a 1/2-14 male NPT thread. It is part of the 7000 Series Ermeto steel flareless fittings, so it is meant to connect tubing without flaring the tube end.

Steel tubing is one of the compatible options for this fitting. It also works with aluminum, hard or half copper, stainless steel, and extra heavy wall tubing that cannot be flared. The flareless design is actually what makes it practical for extra heavy wall tubing, since that material typically can't be flared without cracking or deforming. No special preparation on the tube end is needed beyond what a standard flareless installation requires.