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Question: What is this A764? device on top of 1980 emissions air pump

gms

Member
Joined
Jul 19, 2014
Messages
7
Location
Eastern North Carolina
Corvette
1996 Purple Convertible
What is this on top of the air pump. I do not see it in my 1980 manual and have not seen it in any pictures of 1980 engines. I thought it might be a check value. What is a replacement part?

Thanks for looking
16963528726_40f87743e2_k.jpg
 

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