My sister's house was built in 1972 (I think). It has this outdoor water hydrant on the back wall of her house, and I believe it's original to the house:

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I'd like to know who made this hydrant so that I can replace the cartridge in it. I can't identify the cartridge and the nice man in the orange apron said "He wasn't sure.", but when pressed, conceded he didn't have a clue.

Can anyone in here identify this cartridge and tell me who made it? Thanks in advance.