I want to replace the cartridge for this valve because pulling the handle to turn on the water has become more and more difficult. I would like to figure out what cartridge I need to buy for this. The house was built in 1954, and I suspect that the valve is as old as that.
I think that it might be this valve:
Also, what would the replacement cartridge be? If it's is the 3570, then I guess I would need the 1225 cartridge.