I took some pics last weekend and I'll get them uploaded, hopefully today. (Having some phone usb issues).
In the meantime here are some approx sizes. This is an older single wall coaxial that was made before the twisted/fluted/contoured inner pipe design became common. I haven't cut it open, but I'm assuming its just smooth pipe rolled inside a larger smooth pipe.
Outside tube is around 1.25" and refrigerant flows in it, stubbed out with 5/8" line. The inside tube is 3/4" and water flows through it, again I assuming it's just smooth wall 3/4" copper. The model number sticker is still on it and at one time I had the datasheet downloaded. I will try and locate again & post link.
Len
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