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Can anyone identify this? My best guess was some kind of tool for opening drain clean outs maybe?

The inside says “C.A. Inc.” and “D” which I am guessing is a size. enter image description here

enter image description here

1 Answer 1

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It is an oil filter wrench.

For removing an oil filter from an engine.

It allows the mechanic to use a standard socket wrench to turn the filter.

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    Yes! I knew it looked familiar. I changed my own oil maybe 3 times about 20 years ago before deciding it was too big of a pain for me.
    – bubbleking
    Jul 30, 2023 at 23:25

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