How do you repair a leak in galvanized pipe under the sink?
Answers:
Get a pencil and sharpen it to a five point. Pencils now are made out of graphite so no worries of lead poisoning. Stick the pencil tip in the hole as far as it will go and take a saw blade and cut it off. This will stop the water from dripping as the wood will swell. Next go buy some jbweld metal epoxy at a hardware store and follow the directions to mix it make sure the pipe is dry and coat the pipe with the jbweld and allow it to dry for a couple of days and you should be set. Galvanized pipe is not the right pipe for under a sink but you got what you got so you have to deal with it. Some people think chrome painted pipe is galvanized but it is not and the parent metal underneath is really copper or some other type of metal.
Other answers:
Plumbers putty might do the trick
Plumbers putty might do the trick
replace it, galvanized is not code anyway.
duct tape for now. JB weld in auto stores or wal mart if it pin hole sized. Any bigger, look at replacing.
replace it with a new one, better solution
TApe duh it fixes anything
you do not repair it...you replace it. take it off and take it to the hardware store. they will sell you a new one.
You replace the pipe that has the hole in it ,there is nothing that really repairs it.
Better think of just replacing it with PVC. Galvanized isn't used anymore.
Plumbers putty will do the trick. Get that kind that you have to mash up to mix the two parts. It works great.
The best way is always to replace the pipe, but there are circumstances where that is very difficult.
If it is the preasure side (It goes to the fawcet) Then about the only way to repair it short of replacing it is to use a marine epoxy on it. But first you must turn the water off so there is no preasure in the pipe.
If it is the drain side (sewer) then a marine epoxy will work without taking turning any water off.
Replace it.
Here is a little trick that works great. Take a sheet metal screw about the size of the hole, but not real long, about an half inch or so. Screw it right into the hole. The head of the screw will seal against the pipe and seal it off. Eventually, the screw will rust a little bit and completely seal it off. If it still leaks a little, take the screw back out and put some pipe seal(dope) on it and screw it back in. If it still is a problem, buy a bibb washer from any home store or plumber and put a screw through it and then screw the washer to the pipe. The bibb washer will surely seal it good. I have done this many times for a quick temporary repair until I could get back to replace the pipe. Try it! It should work great for you, and take about 5 mins.!