The threads are straight (not pipe) and the valve screws nicely into the female flare fitting from the heater core. It's just that my valve doesn't have the flare end like the one at Pantera Place. The fitting does not screw into the valve; the hex you see is part of the valve body. And I certainly agree with your comments regarding any sealer. That's why this little project was put on hold until I had the time to work it right. I'm hoping to find an adapter like you mention. I appreciate feedback.
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