Replace/repair chrome toilet shut-off valve

[Artm69]

I have a toilet shutoff valve as shown in the pic. It has threads onto the pipe, a few visible at the junction. I thought it was chrome plated copper but I'm unsure now, could be chrome plated brass? It's not a chrome sleeve over pipe.

Problem is the knob (long broken) will not come off, turning it all the way does not turn off the water.

It's super tight so I don't see how to hold the pipe correctly and not bend it to turn the valve. I can cut it out but I fear that a standard compression valve may not fit because of the potential bigger diameter from the plating.

So, I'm willing to try removing the stem but is the rebuild kit the same for all of these?

Any advice appreciated.

 

[Breplum]

We typically just replace the angle stop with a quarter turn modern angle stop. Preferrably with a stainless steel ball. Avoid plastic ball angle stops.
Preferred size is 1/2" ips x 3/8" compression on the flex side. It is recommended to replace the flex line when doing a change.
The pipe is held stable with a pipe wrench, and crescent type wrench on the angle stop.

 

[Sponsor]

 

[Terry]

Seeing how you are on the East Coast, it's looking like a 3/8" nipple from the wall.

 

[Artm69]

I have a shower pipe to compare to the toilet pipe:

shower circ/dia: 53mm, 0.664"
toilet pipe circ/dia: 62mm, 0.777"

These measurements were taken by wrapping a strip of paper around each and noting the circumference. It's the best I could do.

Does this still suggest a 3/8" nipple? Should I look for a 3/8" threaded valve, like the old one?

 

[Reach4]

OD of the nipple: A nominal 3/8 nipple will be 0.675 inch OD.
2.12 inch circumference or 53.86 mm.

A half inch nipple is 0.84 OD.
2.639 inch around, which is 67.03 mm.

When you say "shower pipe", I presume you mean something from the other side of the wall, and not the shower arm.