I used 1/2" X 3/8" brass barbs purchased at a hardware store. I then placed the barb end into a drill press chuck. The drill press was used like a lathe. I used a file with the drill press turning about 1500 RPM's. I filed the 3/8" threads off untill each barb would fit inside the copper tubing of the heater core. Next I took a small tubing cutter and removed the barbs from the Chevy Chevette heater core. The 1/2" barbs will fit 1/2" ID tubing.
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