More than likely completely wore out I just rebuilt one like it because I had the parts on hand.
Trying to take it apart still connected is a no no it aint gonna happen you will end up breaking your pipe.
It needs to be in a vise with a big wrench and whacked with a hammer.
Trust me I know what I'm talking about.
It is also more than likely a female 1/2 inch pipe thread.
You need a backup on the pipe it is screwed into or you will twist the pipe off.
That means two wrenches not one.
If you said you had joint pain then this is going to be hard for you.
Also my suggestion would be to toss the faucets and put in a full flow ball valve.
That way you can just turn it off and on with a 1/2 turn.
I turn mine on and off with my foot.
If the pipe coming out of the wall is male and you do decide to use PVC which I highly discourage DO NOT screw a female PVC fitting on it.
You can put male PVC into female metal but not female onto male it will split.
It is also against plumbing standards for this reason.
I repeat do not twist that pipe off in the wall you will be screwed big time and have to tear the wall out to fix it.
You just cant unscrew it like you think it WILL twist the pipe off.
You have to have the back up and know how to do it.
If it is sweat DO NOT try to repair that valve by taking it apart on the wall.
You already said that it was rusted out so it just isnt going to happen
If I knew where you lived I would come fix it for you if you weren't too far away.
Honest.
Here is one for any one reading this.
Every year take your valve handles off and put grease on the treads and the spines.
It is called preventive maintenance I do it. and it save a word of trouble down the road.
Your toilet and sink shut off need to be stroked once a year also.
And the flex lines changed out about every ten years with good ones.
Worth
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