Extra O-ring in water pump kit? Optimax 200

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NLaudy

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I just installed a new water pump in my Optimax but I have an O-ring that I am not sure where it goes... does anyone know by chance?

It is the big black one with the red arrow pointing at it in the picture below. It looks to be the same size as the one on the carrier assembly. However the carrier assembly in the kit already had the o-ring installed.




Below is a link to the parts diagram:

https://www.crowleymarine.com/mercury-outboard/parts/7834_250.cfm?mdl=7CAGGL
 
The only other thing that comes to mind is that some rebuild kits fit multiple models and not all parts are used in all applications.
 

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