I have a leaky spigot I'm trying to fix. It does not leak at the spout. It leaks at the handle and it only leaks when I turn the water on (i.e. when a hose is attached and I turn it on, you see water coming out of the handle.) I'm trying to plumb from this spigot to another spigot near my garden so I can leave this permanently on without it leaking.

This is a NIBCO valve if that helps. My goal was to take it apart and replace the packing, but I'm having trouble doing that. I can remove the screw to the handle, but I'm unable to remove the handle. Then I tried undoing the hex below the threads, but my crescent wrench keeps slipping and I'm rounding over the hex, so I abandoned that plan. I feel like my only option is to remove the handle so I can use a socket and get a better grip. Any ideas? I'm really trying to avoid removing a bunch of siding and replacing the entire fitting. The house is about 20 years old and in SC. Please let me know what I need to do. Thanks!

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A roll of string teflon or teflon tape is your friend. Wrap the thread or stem area that is leaking and re-assemble.

Best Wishes

That faucet unscrews from the pipe sticking out of the wall, assuming the pipe is fastened so it does not twist off. If you get it off, then screw a new "sill cock", (which has the integral flange), on to the exposed pipe.

So, you're saying cut away the silicone on the vinyl enclosure and just grab the whole sillcock with a pipe wrench and twist it off?

"Twist it off" might be the operative phrase, depending on the type of pipe it is connected to and how it is secured.

After using penetrating oil on the handle-stem joint, a handle puller should get the handle off. If necessary heat carefully the centre of the handle.

A six point deep socket should then get the packing nut off. Be sure to restrain faucet body with a wrench when applying force on the packing nut.

George is talking about taking it apart, not replacing it, in case you were confused.

How are you able to tell that it is not a sweat on sill cock?

my friend from IL has nailed it once again. you have taken enough apart to repack the stem. wrap some teflon string clockwise around the shaft, put a dab of grease and tighten the packing nut.
you can make teflon string by unrolling a foot of teflon tape and twist it with your fingers so it looks like yarn..

How would they have been able to attach it?

Solder a piece of pipe on to it first, shove it in the hole, connect it inside.

I guess I was assuming it had a basement because that is what i'm used to here in MI. I never assume that it is unaccessable because that is pretty rare for me to come across, but I guess that is common in other parts of the country.