I've reused copper that has been soldered, not my favorite thing to do.
I clean all the old solder off. Heat it, wipe it quickly with a rag. Then finish cleaning it up with 80 grit Emory cloth down to bright metal.
Then use the flux. The solder will only flow where the flux is, so be sure the entire surface, pipe and socket, are covered.
The pipe needs to be emptied of water. Usually opening an outside faucet that is lower than where you are working will empty it. If it's a hot water line, open the T&P valve on the water heater to break the siphon on the line. I've had to vacuum water out with the shop vac, blow it out with the compressor, whatever it takes to stop the steam from blowing the solder out or the water chilling the connection.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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