Got away with soldering American tubing to the Taiwanese. The thicker wall American ID was a little sloppy on the Taiwanese OD, particularly on the hot water side (why ?). It took two tries for each end, while the cold fit better and soldered readily. (The hose clamp will be off tomorrow; it's what I used to keep the tubing in place while I hammered the failed joint apart...don't ask; it wasn't pretty or quiet!)
So, why did the hot side of the tub faucet give out as part of this adventure? And then, the hot side of the under-sink connection done with the same clear vinyl failed!
All is well, my son and his lovely, new, flexible girlfriend came down. He replaced the three last clear vinyl and she got her long arms and dainty fingers up to plug in the hourmeter!
Dinner for them was pleasant and cost less than an hour of paid techie!