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Water Pump 89 GL O-Ring question


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I was encouraged to take care of everything while replacing the timing belts on our newer Subaru, the '89.

The metal tube inserted nto the water pump has an O-Ring on it.  The condition deems replacement is neccessary.  The groove that it resides in is square in nature and the O-Ring is now sporting a rectancular cross-section.

~Is the O-Ring in question just a 25 year old bit of rubber which is now misshapen OR was this O-Ring  originally shaped in a NOT-ROUND  manner?

Thank you, Gentlemen!

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