This is a 2 inch spider gasket from SuperPro, a third party replacement listed as a substitute for SPX0715D, SP0715D, SP715D, SPX715D and O322.
What a spider gasket does
The spider gasket sits between the valve rotor and the valve body and seals off the ports that are supposed to be closed in each handle position. When it hardens, tears or takes a permanent set from heat, water bleeds past to a port it should not reach, and the symptom is usually water going somewhere unexpected rather than an obvious leak.
Part numbers
The listing carries this gasket as O-322-9, and the product attributes also record it as O-322. Both refer to the same gasket. If your paperwork shows any of the SPX or SP numbers above, this is the substitute for it.
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