Deaconblue
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Yeah no, definitely copper. The shutoff seems to work fine if I really crank on it to close it. So at least I might not have to replace that.
I have seen cutoff valves with faucet washers in them. The washer goes bad and has to be replaced and/or you're grinding metal to metal to close. In that case, it's just like replacing any other faucet washer, just need to turn off all the water in the house.
I would try Liquid Wrench on the stubborn screw. Also, sometimes cheating and using vise grips may work.
As a last resort, you can use the torch to sweat the old valve off and sweat/solder a new one in its place. Alternate solution. Make sure you have the outside valve open when you apply heat. If there is any water, it will turn to steam, and the steam needs a place to go. Otherwise, could be bad. Steam will build up inside the pipe and could create enough pressure to rupture it.