I noticed that my toilet was having issues, so I was going to work on it. I turned the value off and discovered the valve doesn't work anymore (This seems to happen alot with 1980s turn valves). So I started looking to replace it, which I thought would be fairly straight forward. But I seem to be having issues finding a replacement that I think will work. I attached a photo of the pipe, because the issue seems to be that I have a 5/8" supply line. I was looking for a push-to-connect (I know those are frowned upon) but I didn't see anything that size. I can solder, even though it's not preferred. Can someone suggest a replacement valve that would make sense?
1/2" nominal copper pipe/tubing is 5/8" actual outside diameter.
The hole inside is slightly bigger than 0.500" for all wall thicknesses.
One handy reference, no endorsement, plenty more to be found:
Since there's no sign of threading there, it's probably a soldered valve on copper tubing/pipe.
Get a 1/4 turn shutoff valve to replace the failed valve. They do much better in that type of service than the multi-turn screw valves do.