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Non-hex socket wrench for Galtmaster

855 Views 1 Reply 1 Participant Last post by  helium44
Hi, I'm trying to remove a recessed Galtmaster cartridge in a bathtub. Here is a link to it:

As you can see, the nut is not hex shaped; it has 2 flat sides, and 2 rounded sides. Where would I get a socket wrench for this (as it's recessed)? I don't even know what it's called so I can search for it on the Internet. All I get is hex shaped socket wrenches.

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I didn't realize I need to take off the escutcheon. Now I'm stuck trying to get that off. It's been there for 50 years...
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