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Thank you so much for your input guys! While waiting for replies I did further digging and eventually figured out that it was soldered on. So I decided to bypass changing the shut off valve since it still works even though it looks like crap and I needed a new toilet lol. Perhaps I will tackle it very soon :) I think I will end up cutting it to put new ...
It looks like it is soldered. You can either resolder on another valve or use a compression valve. I use compression valves for shut-offs and just installed this one. If it isn't soldered then then the nut closest to the wall turns out and there is a pin under it. You have to take the pin out to release the compression valve - if it were a sharkbite or ...
Typically, the valve solders to the 1/2 inch water source pipe. the outlet is a pretty standard 3/8" compression fitting. It is a little hard to tell from your pics, but it is rare that the valve would be a threaded fitting to the water source, but not unheard of. The differences between the valves pictured are that the top pic is a 90 degree 1/4 turn valve ...
It looks like both ends just screw on. Turn off the house water, unscrew both ends, take it with you to get the replacement (or make several trips like me).
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