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make sure there is no moisture at all in the pipes. If there is then using a piece of white bread insert the white portion (No crust) into both ends of the pipe as far as you can using a pencil. You want to insert enough to absorb the moisture. Next sand the pipe so that when you install the fitting you can see at least 1/4" of the sanded portion sticking out above the fitting. Sand inside the fitting. Next apply a small amount of flux to the outsude of the pipe and inside the fitting. Place together and if you can twist the ffitting around on the pipe (Not really needed, but helps to spread the flux). Next heat the joint at where you want the solder to go (Back of the fitting) as the solder will travel towards the heat. Heat it untill you can just lay the solder on top of the joint and the heat from the pipe melts the solder. This is important as the pipe must melt the solder, not the torch. let the solder run around the fitting applying more heat to the fitting if the solder stops running. Good tip is you only need a lenth of solder compatable to the pipe size you are soldering (1/2 inch long piece of solder for 1/2" pipe, 3/4" lenth of solder for 3/4" pipe, and so on) Too much solder will puddle up inside the fitting. After you are done place a wet rag over the soldered joint, this water will set the solder. Next remove the supply line from the fixture you just repaired and turn on the water making sure the end of the supply line is in a container to catch the water. This will blow out the bread. Re connect and you should be fine.
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