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Stop the water with a pipe plug
Don't try to solder pipes with water in
them. When you're repairing or tying in to existing copper
pipes, it's common to find a small amount of water in
them even after you close the valve and drain the pipes.
Soldering a joint in pipes that contain even tiny amounts
of water is nearly impossible. Most of the heat from the
torch goes into turning the water to steam, so the copper
won't get hot enough to melt the solder. Stop the trickle of water with a pipe plug.
Push the plug into the pipe with the applicator tube provided.
When you're done soldering, dissolve the plug by
holding the torch under the spot where the plug is. Plugs for 1/2-in. or 3/4-in. pipe are sold at home centers and hardware stores.
An old trick was to stuff a wad of soft white
bread into the pipe to stop the trickle of
water temporarily. This works but
you run the risk of clogging
aerators and valves with